Diseases

5 Livestock Diseases That Could Impact U.S. Food Security and Economic Stability

Thu, 11 Dec 2025 20:45:02 GMT

Production animal disease outbreaks are not only animal health events but threats to economic stability and food security. A new report from The Farm Journal Foundation , The Mean Sixteen: Biosecurity Threats Facing U.S. Agriculture, estimates the collective annual costs to U.S. agriculture due to outbreaks of the top five livestock diseases could top $300 billion without proper preparation.

“It is absolutely crucial that the U.S. should support mechanisms to protect farmers from risks and make sure that our food supply chain can remain resilient even when challenges occur,” wrote Stephanie Mercier, senior policy adviser at Farm Journal Foundation.

Mercier identifies five diseases with the potential to disrupt U.S. livestock production, trade and response infrastructure at scale. These include foreign animal diseases as well as ongoing threats:

Foot-and-mouth disease (FMD)
African swine fever (ASF)
New World screwworm (NWS)
Highly pathogenic avian influenza (HPAI)
Porcine reproductive and respiratory syndrome (PRRS)

Foot-and-Mouth Disease: Trade-Stopping Risk to U.S. Livestock

Foot-and-mouth disease, an infectious and sometimes fatal viral disease affecting a range of ungulates, remains one of the highest-impact foreign animal disease threats to U.S. agriculture. While the U.S., Canada, and Mexico are classified as FMD-free, outbreaks in Taiwan (1997), the United Kingdom (2001), and this year in Germany and Hungary, represent how relevant this disease remains as both an animal health and economic threat.

Modern production systems characterized by high animal density and frequent interstate movement would complicate containment efforts in case of an outbreak. In 2015, a report from Kansas State University found an FMD outbreak beginning in a U.S. state with high populations of vulnerable livestock could cost nearly $200 billion to the U.S. economy if no emergency vaccine program was implemented.

A 2018 provision to the farm bill mandated the establishment of an animal vaccine bank; FMD was chosen as the first disease for vaccine stockpile. While FMD vaccines reduce an animal’s chance of being infected, they are generally not administerd in FMD-free regions as it is difficult to distinguish between vaccinated and FMD-infected animals in a clinical setting. Further, World Organization for Animal Health (WOAH) protocols allow for trade bans to be imposed on countries using these vaccines.

African Swine Fever: Persistent Threat to U.S. Pork Production

African swine fever has expanded globally over the past decade and remains one of the most significant threats to the U.S. swine industry causing hemorrhagic fever with high mortality rates. In 2018, a massive ASF outbreak in China resulted in the loss of half of the country’s swine herd, approximately 225 million animals, and cost the country’s economy around $111 billion. Since then, ASF cases have been reported in countries across much of Asia and Europe .

(Farm Journal Foundation)

It has been estimated an ASF outbreak in the U.S. would cost the economy nearly $80 billion, due to loss of exports and reduced industry revenue, but could also affect the crop sector due to decreased feed demand. The extensive feral hog population across much of the country would further complicate containment efforts.

There is no globally available ASF vaccine; however, in May 2025, the WOAH adopted their first international standard for ASF vaccines . This was followed by the release of field evaluation and post-vaccination monitoring standards in July.

New World Screwworm: Reintroduction Risk and Surveillance Dependence

The NWS fly lays eggs in an animal’s skin, often at wound sites, and the hatched larvae burrow into the animal, consuming the flesh. Prior to 2025, NWS had been largely absent in the Western Hemisphere north of Panama; however, since the beginning of the year, outbreaks have been creeping northward, with most recent detection being just 120 miles south of the U.S.-Mexico border.

The USDA estimates that if NWS were to cross the border into Texas, it could cost the state’s economy at least $1.8 billion while putting the rest of the U.S. beef sector at risk. In an effort to tackle this threat, the USDA announced a five-pronged plan to combat the pest including sterile fly production, closing of the U.S.-Mexico border to cattle trade and increased communication with state animal health officials.

The same sterile male fly technique that eradicated the pest in the U.S in 1966 is being applied for the current outbreak, with sterile fly production facilities open in Tampico, Mexico and opening in Edinburg, Texas .

While no NWS cases have been detected in the U.S. yet, the fly is still having an impact on the economy. With the U.S.-Mexico border closed to cattle imports , the already reduced U.S. cattle herd could shrink even further. With strong demand supporting U.S. beef prices, Omaha Steaks CEO Nate Rempe predicts ground beef prices could reach $10 per pound by the third quarter of 2026.

(Farm Journal Foundation)

Highly Pathogenic Avian Influenza: An Ongoing Multispecies Challenge

Highly pathogenic avian influenza remains an evolving threat to U.S. animal agriculture. Twice in the past decade, major outbreaks in the U.S. have devastated poultry operations with losses of over 50 million commercial birds from 2014 to 2015. The latest HPAI outbreak began in 2022 and has since been detected in flocks in all 50 states resulting in an estimated loss of 169 million birds as of April 2025.

(Farm Journal Foundation)

HPAI is a zoonotic disease with reported infections in humans, hogs, cats and dogs. In March 2024, HPAI was detected in dairy herds in Texas and Kansas. Since then, HPAI outbreaks have been confirmed in over 300 dairy herds across the U.S. in 14 different states.

The 2014 to 2015 HPAI outbreak is estimated to have cost U.S. agriculture over $1 billion when accounting for losses to both the poultry and animal feed sectors, as well as losses in land value. Both this outbreak and the subsequent 2024-25 outbreak caused significant spikes in egg prices, with March 2025 prices rising to 350% of those of the previous year. U.S. milk prices have not yet been affected by the outbreak.

(Farm Journal Foundation)

Porcine Reproductive and Respiratory Syndrome: Endemic Disease, National Cost

The infection of hogs by PRRS has had a significant impact on the U.S. pork industry. First detected in the U.S. in 1987, PRRS infection causes pregnancy loss in sows and respiratory problems in pigs of all ages leading to poor performance. Unlike other animal diseases, PRRS infection can go undetected until issues with pregnant sows occur.

Analysis from Iowa State University shows PRRS caused an estimated $1.2 billion per year in lost production in the U.S. swine industry from 2016 to 2020. This marks an 80% increase over numbers reported a decade earlier.

With no cure at present, disease impact is minimized through biosecurity practices, vaccinations and management of infection with antibiotics. In April 2025, FDA granted PIC approval for the gene edit used in its PRRS-resistant pig. This technology could have a large impact on animal welfare, production costs and pork prices if adopted, though any impact is likely many years out.

Policy and Preparedness Implications for U.S. Animal Health

Across these diseases, the report identifies recurring gaps in U.S. animal health preparedness that extend beyond individual pathogens and suggests some key policy and infrastructure needs to help mitigate these threat risks:

Improved national biosecurity coordination including culling guidelines
Training for veterinarians for outbreak identification and reporting
Support for vaccine stockpiling programs and prioritized regulatory approvals for prevention and treatment products
Increased research support for both international collaboration and domestic work on biological control techniques of pests and pathogens, and disease-resistant genetic traits

“Investing in agricultural research, development and the long-term viability of our food supply chain is critical for protecting our national security and economy, and we are hopeful that our nation’s leaders will rise to meet this challenge before it’s too late,” Mercier writes.

The Farm Journal Foundation is a farmer-centered, non-profit, nonpartisan organization, created by Farm Journal in 2010, working to advance agriculture innovation, food and nutrition security, conservation and rural economic development.

Vesicular Stomatitis Outbreak in Arizona

Fri, 14 Nov 2025 17:00:39 GMT

USDA’s Animal and Plant Health Inspection Service has released a situation report on vesicular stomatitis virus (VSV) after the virus was identified on two Arizona farms this month.

While both reported cases were in horses, VSV also affects cattle, swine and other ruminants. The farms on which the virus was identified both also house cattle, though none have been found to be clinically affected.

In response to this outbreak, the Canadian Food Inspection Agency (CFIA) has announced temporary import restrictions on horses, ruminants and swine from the U.S. until further notice. The import of horses, swine and ruminants from VSV-affected states for all purposes is prohibited. Animals from other states that have been in a VSV-affected state at any point in the three weeks prior to import will be denied entry to Canada. Special accommodations have been made in collaboration with USDA regarding animal import for major Canadian livestock competitions and exhibitions.

What is Vesicular Stomatitis?

Vesicular stomatitis (VS) is a viral disease primarily spread by biting midges and flies, but can also be spread via animal-to-animal contact or exposure to saliva or fluid from ruptured vesicles. It is also important to protect yourself if working with infected animals as it is transmissible to humans causing an acute influenza-like illness.

VS is named for its characteristic vesicular lesions that form around the mouth, nose, udders and hooves. Along with these lesions, clinical signs of VS include:

excessive salivation (often accompanied by raised blisters on the lips, gums and tongue)
fever
feed withdrawal leading to weight loss

In cattle and horses, lesions around the hooves can lead to lameness, while teat lesions in dairy cattle can lead to mastitis and a severe drop in milk production. Affected swine usually first show signs of lameness caused by foot lesions.

Controlling Vesicular Stomatitis

While VS does not usually cause the death of an animal, it can lead to economic losses due to prevented animal movement and impacts on international trace. Farms with VSV positive animals must quarantine for 14 days after lesions appear on the last case at the location.

The last VS outbreak occurred from May 2023 through January 2024 affecting 319 locations across California, Nevada and Texas. VSV circulates annually between livestock and insect vectors in southern Mexico, only entering the U.S. when environmental factors support the northern movement of vectors.

If you suspect an animal might be infected with VSV, you should immediately contact local state and federal animal health authorities.

Emergency Use of Animal Drugs Approved to Combat New World Screwworm

Tue, 19 Aug 2025 16:09:22 GMT

The U.S. Department of Health and Human Services (HHS) issued a declaration on Aug. 19 allowing the U.S. Food and Drug Administration (FDA) to issue Emergency Use Authorizations (EUAs) for animal drugs to treat or prevent infestations caused by the New World screwworm (NWS).

This declaration applies only to drugs for animals. NWS infests warm-blooded animals, including livestock, pets, wildlife, and, in rare cases, humans, causing severe tissue damage and sometimes death. The risk to human health in the U.S. remains very low, but the potential future threat to animal populations and the food supply chain requires proactive action.

Although eradicated from North America and Central America decades ago, NWS has progressed north since 2022 and is now approaching the U.S. border with Mexico. This parasite poses an emerging threat to livestock and food security, with potential impacts on both national security and animal health.

“Today we are taking decisive action to safeguard the nation’s food supply from this emerging threat,” says HHS Secretary Robert F. Kennedy, Jr. “This authorization equips FDA to act quickly, limit the spread of New World Screwworm, and protect America’s livestock.”

Currently, there are no FDA-approved drugs for NWS in the U.S. The FDA through an EUA can authorize the flexible, faster use of certain animal drug products that may be approved for other purposes, or available in other countries, but not formally approved for NWS in the U.S. This ensures veterinarians, farmers, and animal health officials have timely access to the tools they need to protect pets, livestock and the nation’s food supply.

“Thank you to my friends and partners Secretary Kennedy and Commissioner Makary who are answering the call and supporting our aggressive plan to push back and ultimately defeat this devastating pest. This emergency use authorization is another tool we can use in the fight against New World Screwworm,” says Secretary of Agriculture Brooke L. Rollins. “Our cattle ranchers and livestock producers are relying on the Trump Administration to defend their livelihoods. Stopping this pest is a national security priority and we are linking arms across President Trump’s cabinet to defend our borders and push back this threat.”

FDA Commissioner Marty Makary, M.D., M.P.H., adds, “Our priority is to safeguard both animal health and the nation’s food supply. FDA is acting swiftly and responsibly to help ensure we have the necessary tools to prevent and control New World Screwworm, minimizing risks to agriculture and public health.”

FDA will provide future guidance to veterinarians and stakeholders on the appropriate use of any products authorized for emergency use and update the New World Screwworm: Information for Veterinarians page.

The Smell You'll Never Forget: An Animal Infested with New World Screwworm

Thu, 10 Jul 2025 16:41:23 GMT

“The stench…it’s like roadkill stewed in infection,” explains Jose Santiago Gallardo Espinosa, a cattle producer from Chiriqui, Panama, describing an animal that has been infected with New World screwworm (NWS). “You’ll smell it before you see it.”

He goes on to describe the appearance. “That little dehorning scrape you didn’t worry about? Now, it’s a fist-sized hole pulsating with maggots. Not on top, under the skin. Hundreds of cream-colored worms with screw-like spines, eating your cow alive.”

It’s a Plague in Panama

Gallardo is a Panamanian livestock production specialist and animal science professional with a diverse and practical background in cattle production, agricultural policy and international ranch management. He currently serves as the technical assistance team manager at Cooleche, R.L., where he leads strategic initiatives in cattle production and technical outreach.

“⁠This ain’t ‘just flies.’ We’ve buried calves eaten alive in 48 hours,” Gallardo stresses. “Post-calving cows are sitting ducks, I found one last week with maggots deep in her vulva, she was trembling as she tried to nurse her calf.”

An animal health professional treating an animal in Panama that has been infected by New World Screwworm.

(Jose Santiago Gallardo Espinosa)

To catch NWS and stop the spread, Espinosa encourages daily wound checks including navels on newborns, vulvas on fresh cows, sheaths on bulls, branding cuts and tagging nicks. Some red flags include a wound that swells overnight or oozes cloudy fluid and a milk tank mysteriously dropping.

“Treat every scratch like a ticking bomb,” he says adding if you find one with a wound acting a little strange, you should “peel back skin edges, and if you see rice-grain maggots with dark spines — sound the alarm.”

He says more than 6,500 cases have erupted across Panama, marching north through Central America like a plague.

“For years, our U.S.-Panama barrier kept NWS at bay,” Gallardo says. “We’d see maybe 25 cases a year — it was a nuisance, not a crisis. Then 2023 hit, and overnight our pastures became war zones.”

He says the reality in Panama is rainy season is maggot season.

“Here, in Chiriquí’s dairy country, it is the perfect storm,” he says. “Rainy season humidity of 90%, 85°F heat and flies everywhere. A single-infected cow bleeds $10/day in lost milk — its life or death for small dairies.”

NWS in Nicaragua

Ernesto José Sequeira Enríquez, an agronomist from Camoapa, Nicaragua, says NWS was eradicated from Nicaragua in the 1990s. He says he first encountered it during an internship in Brazil where he experienced the serious challenge the fly causes.

“When cases began appearing here again last year, I was able to use what I learned in Brazil to prepare veterinary supplies and train people on prevention and treatment,” he explains.

(Ernesto José Sequeira Enríquez)

He says it’s essential to enforce a daily inspection routine, checking every animal carefully for open wounds.

“When you find an infected animal, you’ll typically see a bleeding wound,” Sequeira says. “If the infestation has progressed, there will be a strong, foul smell due to tissue damage and the presence of larvae.”

He encourages U.S. producers to be prepared with sufficient supplies of veterinary medicines and insecticides for both treatment and prevention and to adjust management practices to reduce risk. For example:

When dehorning, branding or ear tagging, apply insecticide spray to the wound immediately.
Ensure proper care of newborn calves by disinfecting the navel with iodine solution as soon as possible, since that is the most common entry point for infestation.

“Although complete control of screwworm is not possible, taking preventive measures significantly reduces the economic and productivity impact of it,” he says. “Early detection and consistent preventive practices are critical to minimizing losses.”
Sequeira stresses a producer’s eyes and hands are their best tools to fight NSW.

“My warning to U.S. ranchers is this isn’t just a Panama problem,” he summarizes. “Newborn calves are maggot magnets. If you lose one calf to a navel infestation, you’ll never sleep again. Make inspections sacred — no excuses. Report fast and hide nothing.”

It’s Endemic in Brazil

Marcelo Costa is a veterinarian, professor and cattle business consultant in Brazil and Paraguay. In 1999, Costa was taught embryo transfer at Camp Cooley in Franklin, Texas. He then returned to his family’s third generation ranching operation where they started Camp Cooley Brazil.

“I have been dealing with screwworm all my life since it is endemic in Brazil,” Costa says. “Screwworm-infected animals happen all months of the year.”

A wound in the animal skin full of screwworm and new fly eggs in the skin borderline

(Marcelo Costa)

Like others, he has experienced finding infected animals with bleeding, foul-smelling wounds. He says animals show discomfort and may not follow the herd as normal.

“Newborn calves are usually the more attacked category because of the navel’s wet and bloody tissue,” he says. “If a screwworm infects the navel, it may open a door at the site for more severe infections that may cause diarrhea, pneumonia and other diseases.”

Costa stresses how much NWS costs producers beyond animal loss and decreased productivity.

“One of the biggest problems with NWS is the increased labor with vigilance and animal treatment,” he summarizes.

Guatemala Producers Are Learning to Cope with NWS

“Screwworm came to teach us the times are changing, and that any type of production is possible and open to any complication,” says Oscar León, a livestock production specialist and agricultural business administrator from Guatemala City, Guatemala. “Brazil learned how to cope with it, and Guatemala is in the process of it. The U.S. is not exempt from it, unfortunately. But with the adequate measures and prevention techniques, one can learn and teach others. We can make the impact less harmful on our production and wallets.”

(Oscar León)

León currently manages his family’s cattle operations and leads LAVAT S.A., a company that imports and distributes innovative animal health and nutrition products tailored to the needs of the Guatemalan livestock sector.

He explains it is important for producers to look for and treat any open wound or bruise as they are the first indicators.

“If an open wound smells like the scent of rotten meat, you will find the presence of screwworms feeding off live tissue,” he says. “Prevention and early timing are the best ways to treat screwworm. Make sure to take your time, observe your cattle, search for a bruise or wounds and treat them properly.”

He also stresses the importance of making sure everyone who works in the farm or ranch is aware of NWS and knows how to react if an infection is found.

Educating U.S. Producers

Chris Womack, a veterinarian and rancher from San Angelo, Texas, says he remembers helping his dad treat calves with NWS infestations.

“I can still remember the smell,” Womack says. “I thought it was cool because I was a little kid, and we dug maggots out of the calves. I can still smell it like it was yesterday, and it was horrible to look at them.”

Womack shares a historic context of NWS, which he says means “man-eater,” on the “Registered Ranching” podcast with Tucker Brown.

Womack also describes the emotional toll on the producer when faced with NWS.

“If you’re a steward of an animal and it has half of its head rotting off, or its abdomen is a gaping wound because the maggots are eating it up, or it gets in their ear and they’re walking around in circles with brain damage because they got meningitis, well, it’s devastating.”

Womack summarizes NWS isn’t just an agricultural issue, it’s a human health concern. Historical accounts and recent data from Panama show NWS can affect humans, particularly vulnerable populations like homeless individuals or those in areas with limited medical access.

Womack says the experiences with NWS during his childhood is the reason he is a veterinarian today. He says there is a generational ignorance in the U.S. regarding NWS, and that is something he is committed to fixing.

“The only way we can overcome ignorance is education,” he stresses.

Your Next Read: Breaking: Mexican Border Closed Again as New World Screwworm Comes Within 370 Miles of the U.S.

Protect Your Livestock: Signs of New World Screwworm

Tue, 01 Jul 2025 15:45:17 GMT

Lizeth Olivarez doesn’t know if people will have the stomach to deal with New World screwworm (NWS). She’s a sixth-generation rancher who runs cattle in the U.S. and in Mexico at Las bendiciones Ranch in Realitos, Texas, and Rancho El Cuellareno in Guerrero, Tamaulipas.

Although she hasn’t experienced it herself, she has grown up hearing story after story about NWS from both her grandfather and father who dealt with NWS when the deadly fly struck in the 1960s. With reports of NWS in seven states in Mexico, the U.S. continues to bolster its defenses to keep the pest out.

(USDA)

“The first time around NWS was eradicated by using sterile flies dropped from planes in a box that look like a Big Mac burger box with a target sign on it,” Olivarez says. “The only way to eradicate the NWS is with sterile flies.”

Secretary of Agriculture Brooke Rollins announced a five-pronged plan to combat NWS on June 18 partnering with Mexican counterparts and using this sterile insect technology to stop the spread.

“It’s important to clarify we currently don’t have [NWS] here in the U.S.,” says Russ Daly, Extension veterinarian for South Dakota State University.

He admits it’s a strange name for a fly – New World screwworm – because it makes you think it’s a worm.

“It’s not actually a worm – it’s the larvae of the NWS fly that deposits its eggs in animals,” he explains. “They can get big in size, up to two-thirds of an inch. The first person who described them might have thought they look like little worms. They have ridges that are spiral, and that allows these larvae to burrow down into the animal. That’s how they get their name.”

The NWS fly lays eggs and larvae in open wounds of warm-blooded animals. Daly says NWS’s function is similar (but different) to a maggot. Domestic blow flies lay their eggs on dead tissue. The resulting maggots feed on the dead tissue. The difference with NWS is it lays its eggs on living tissue and will feed on living tissue.

“NWS is not easy to recognize,” Daly adds. “You really need an entomologist to recognize the fly and the larvae. For recognizing a problem in the animal, it might come down to recognizing a larval infestation that is showing up in unusual circumstances.”

(Lori Hays)

It’s Not Just a Cattle Problem
Megan Niederwerder, executive director of the Swine Health Information Center (SHIC), says it’s important to remember this is not just a cattle disease – it impacts other livestock species and humans as well.

(Lori Hays)

“The fly can deposit its larvae in any open wounds as well as surgical sites such as castrations and umbilical sites after a newborn animal is born. It can also deposit its larvae in any mucous membranes,” Niederwerder says. “Keep an eye on non-healing wounds or wounds that have a foul odor or bloody discharge.”

She says the animals often feel discomfort and pain due to this non-healing wound so they may isolate themselves and be off feed.

“It’s really important to stay vigilant as we think about increasing awareness and understanding of what the fly looks like,” Niederwerder says. “We also need to understand what the clinical signs may look like as the introduction and incursions in Mexico have increased the risk for the U.S., too.”

Although the cases in Mexico have been primarily cattle, she notes there have also been cases in pigs, horses, sheep, goats, dogs and even in humans in Mexico.

“We really don’t like to think about that human part of it,” Daly says. “I don’t want to downplay it, but in people, we would certainly know when we have an irritation or when a fly is on us. But we need to think about the people who potentially are debilitated and wouldn’t know they have a fly on them for a long period of time or that something’s wrong.”

Watch Out for the Unusual
Olivarez urges producers to call their veterinarian immediately if they suspect NWS. During the 1960s outbreak in the U.S., she says most ranchers first noticed it around the umbilical cords of newborn calves.

“It affected ranches the most, especially those that had cattle out on the range where you need manpower to monitor for open wounds, cuts or sores of any kind as well as cows with newborns since the fly will attack the umbilical cord,” Olivarez explains.

She says it’s not only important to monitor cattle but also pay attention to wildlife and pets that live on your property since they could indirectly bring NWS.

Daly challenges livestock producers to pay attention to unusual situations. If you have an animal that suddenly has a lot of necrotic tissue that fly larvae (maggots) are trying to clean up, Daly says that’s a sign producers need to take seriously.

(Lori Hays)

“If there isn’t a wound or a very good reason why there would be an infestation of those larvae that should tip off animal owners, caretakers and veterinarians,” Daly says. “There needs to be some sort of break in the skin to attract the NWS fly, but that something can be so minuscule you wouldn’t even notice it.”

He says it could be as small as a bug bite and is often so tiny producers don’t know how the initial entry even happened.

“NWS does its damage by burrowing into living tissue,” Daly explains. “But they can be drawn to the animal through secretions from that minor break in the skin, and then start to invade the living tissue as well. In addition, once the NWS sets up the wound and causes the infestation, normal blow flies then can come in and get in there, too.”

(Lori Hays)

The females lay their eggs very quickly, he adds. It doesn’t take long for the larvae to develop from there. He says the flies like to deposit their eggs on their “victims” in the afternoon.

“They choose this timing because when it cools off at night, it helps the development of the eggs into the larvae,” Daly says. “This all happens within 10 to 12 hours. If you have a fly that gets into a nick on a pig in the afternoon, for example, by next morning, there’s larvae starting to burrow in already.”

The fly has a lifespan of 28 days, Olivarez shared with followers of Texas Farm Bureau on TikTok.

@txfarmbureau Ever heard of the New World screwworm? South Texas rancher Lizeth Cuellar Olivarez breaks down why this tiny pest is a big problem for livestock. #texasfarmbureau #agtok #farmtok #fyp #screwworm ♬ original sound - texasfarmbureau

“During this time, NWS can lay eggs four times and lay 300 eggs each time,” Olivarez says. “If it goes untreated, after three weeks the larvae will fall and convert to a fly that then goes looking for another animal to attack.”

Treatment Tactics Aren’t Pretty
If an animal becomes infested with NWS, treatment is not easy or pleasant. The larvae have to be removed, Daly explains.

“NWS does respond to some insecticides that we would use for show pigs or horses during the summer to keep the flies off,” Daly adds. “But in order to get that animal healed up, the larvae have to be flushed out and removed by a veterinarian. These infestations can lead to secondary infections to worry about. And, if the infestation has gone deep enough, there could be severe muscle damage or damage to other organs that are beyond help.”

Treatment products need to be considered, adds Lisa Becton, assistant director of SHIC. Because of this, wound care is key during NWS infestation.

“If you have animals that have sores, it’s very important to treat that wound,” Becton says. “You may or may not be able to use a sealant, whether that’s iodine or antibacterial. Wound care is very important to help get a wound healing fast, even if you also have to use antimicrobials for an animal to help prevent other infection.”

It is treatable, but NWS is a painful event for animals and humans alike, Becton says. Rapid identification and action are critical.

Stay Alert, But Don’t Panic
Livestock trade and wildlife migrating due to different issues with climate and weather have helped move the infestation further north.

“The flies actually don’t fly that far,” he explains. “They typically fly less than 10 to 12 miles in their life span. So, they aren’t flying over on the wind and getting into these new places. It has more to do with animal movement.”

Fortunately, Daly says NWS is like any other fly in that they need somewhere to overwinter, so they won’t survive freezing temperatures. However, if they moved into this region in June or July, they would have a foothold until the frost.

“When we let our guard down and don’t look for it as much, or don’t use the sterile flies as often, that’s when things fire up again,” Daly says.

He says it’s not time to panic, but it’s important to be observant. The basics of good animal husbandry remain the most important thing for producers to focus on now.

“Sometimes it’s much easier said than done, especially in outdoor raising situations,” Daly says. “From fly control to monitoring animals, the best way to snuff something out like this quickly is good observation and animal care.”

Your Next Read: New World Screwworm: The Billion Dollar Battle at the Southern Border

New World Screwworm: The Billion Dollar Battle at the Southern Border

Fri, 20 Jun 2025 18:27:59 GMT

Nearly 60 years ago, the U.S. eradicated New World screwworm (NWS). Today, the risk of reintroduction is real. So real that Ethan Lane with the National Cattlemen’s Beef Association (NCBA) says it’s not a matter of if NWS will reach the U.S. but when.

“We need to spend $300 million now to save us $8 billion down the line in eradication costs,” says Lane, who serves as the senior vice president of government affairs. “This is a marathon, not a sprint, and it’s going to take years to re-eradicate New World Screwworm and push it back to Panama.”

As the fight to keep NWS out of the U.S. ramps up, the economic impact on ranchers and the industry is top of mind.

“Successfully eradicating New World screwworm from the U.S. in 1966 cost stakeholders’ tens of millions of dollars,” says TR Lansford III, DVM, deputy executive director and assistant state veterinarian with the Texas Animal Health Commission. “The freedom from NWS provides an estimated $1 billion in direct benefits to livestock producers and $3.7 billion in benefits to the general economy annually.”

Financial Impact of NWS On Ranchers
Regular, large-scale outbreaks of NWS started occurring in the U.S. in the 1930s. According to APHIS, producer losses have reached:

1930s and 1940s — $5 million to $10 million per year
1950s and 1960s — $60 million to $120 million per year
1970s — $132.1 million per year (While the U.S. successfully eradicated the devastating pest, there have been outbreaks, primarily in Texas, since then.)

(APHIS)

Experts agree if NWS reaches the U.S., eradication today will be far more expensive due to the size of the cattle herd, speed and distance of cattle movement in commerce, and increased wildlife interfaces.

“Historically it cost tens of millions, and now it’s estimated to cost into the billions of dollars to eradicate this pest if it gets back to the U.S,” Lansford says.

Based on historical data from an isolated outbreak in Texas in 1976, per-head impact reached $452 in today’s dollars, totaling $732 million.

“[NWS] is a highly impactful foreign animal pest because it is expensive and deadly,” Lansford says. “Back in 1935, when screwworms were endemic in Texas, the state lost about 180,000 head of cattle alone in that year.”

Lansford says the industry will see decreased livestock production and increased veterinary services, medication, insecticide, labor and vehicle costs for the inspection and treatment of NWS.

“Infested wounds and/or mucous membranes and lesions created by this pest cause significant distress and damage to an animal, which can lead to chronic conditions making the animal less marketable and less productive in its lifespan,” he adds.

USDA Investment to Fight NWS
The reopening of Moore Air Base in Texas as a sterile fly distribution facility has an estimated price tag of $8.5 million. A brand new production facility, which would take two to three years to build would cost $300 to $600 million, depending on location and resources.

“That doesn’t include what it would cost to continue to operate one of those facilities,” Lansford says. “Certainly, research dollars also need to be spent to develop more effective treatments and other methods and modalities that we can use to help offset not only the infestations, but help prevent those infestations.”

USDA is also investing $21 million in the renovation of an existing fruit fly production facility in Metapa, Mexico, to further the long-term goal of eradicating NWS.

Border Closing Impacts U.S. Cattle Industry
Since May, Agriculture Secretary Brooke Rollins has suspended imports of live cattle, horses and bison from Mexico to keep NWS out of the U.S. Many U.S. cattle feeders depend on Mexican cattle to fill feedlots, especially now when the U.S. cattle inventory is at a 74-year low.

“Mexico exports, on average, 1.2 million head of cattle to the U.S. each year,” says Kathy Simmons, chief veterinarian for NCBA.

Obviously, that number will take a hit with the border closed, but Simmons says even prior to the May 11 suspension, mitigation protocols for NWS, including wound inspections, for cattle from Mexico allowed less than 25% of the usual numbers to cross the southern border each month.

As the U.S. fights to limit the impact of NWS, it’s a long-term battle, reminds Lane with NCBA.

“They’re getting those flies on that leading edge of the incursion. As I understand it, that is slowing the advance in a way that is very good to see,” he says. “The fact is, there are just so many different vectors. There are so many different ways this thing can move north, and we’re going into the hot season where flies thrive. So it’s really about slowing it, about preparing and about making sure we have the resources to meet it and push it back down as quickly as possible. But certainly everyone’s trying to focus right now on trying to hold the line as much as humanly possible.”

As Lansford has come to realize: “This pest will be one that leaves quite a mark on our economy.”

Your next read: How to Win Beef Consumers’ Trust: Authenticity and Responding to Concerns

Mexico Takes Additional Measures to Help Fight New World Screwworm

Thu, 01 May 2025 18:24:33 GMT

USDA has announced that Mexico agreed to additional measures to help fight New World Screwworm (NWS). The U.S. had given Mexico a deadline of April 30 to follow protocols in place or the U.S. would put restrictions on cattle imports.

USDA Secretary Rollins posted on X.com that Mexico has resumed efforts to help fight NWS with the following:

Eliminate restrictions on USDA aircraft
Waive customs duties on eradication equipment
Increase surveillance

(X.com)

Rollins says ports will remain open to livestock imports at this time, however if at any time these terms are not upheld, port closure will be revisited. The secretary had sent a letter to Mexico outlining the expectations for cooperation on the issue.

Protocols had been established in February after the pest was discovered in southern Mexico in November 2024.

“I am happy to share Mexico has continued to partner in emergency efforts to eradicate the New World Screwworm,” Rollins says. “This pest is a devastating threat to both of our economies, and I am pleased to work together with Mexico in good faith to protect the livelihoods of our ranchers and producers who would have been hurt by this pest.”

Rollins reiterated that USDA is working every day to keep pests and disease from harming the agricultural industry.

“I thank our frontline USDA staff and their counterparts in Mexico for their work to ensure the screwworm does not harm our livestock industry,” she adds.

NWS is a deadly parasitic fly that infests warm-blooded animals, causing severe wounds and complications that can lead to death.

Your next read: Streamline Spring Cattle Processing with These 3 Stress-Reducing Steps

What Do Foot-and-Mouth Disease Outbreaks in Europe Mean for the U.S.?

Fri, 28 Mar 2025 22:09:30 GMT

Foot-and-mouth disease (FMD) is rearing its ugly head in Europe. After an outbreak in water buffalo in Germany in January, an outbreak in cattle in Hungary in early March and an outbreak in cattle in Slovakia last week, why now? What is the U.S. doing to keep this foreign animal disease out and protect the country’s livestock industry?

“FMD is caused by a virus that affects cloven-hoofed animals so that can include cattle, pigs, sheep and goats,” explains Megan Niederwerder, DVM, who serves as the executive director of the Swine Health Information Center (SHIC). “It does not affect humans and is not a threat to food safety, but it has significant trade implications once it is introduced into a country.”

FMD has been fairly quiet in these European countries – with no cases reported for decades. Other parts of Europe have seen outbreaks more recently like the 2001 outbreak in the United Kingdom that caused a crisis in British agriculture and tourism and resulted in the cancellation of the World Pork Expo held in Des Moines, Iowa.

“FMD really decimated the United Kingdom,” says Barb Determan who was serving as president of the National Pork Producers Council (NPPC) at the time. “It became very apparent that we couldn’t guarantee the safety for our U.S. pig herd because of the high numbers of international travelers that would be at the show. We had to cancel World Pork Expo out of an abundance of precaution.”

Although there is still a lot to be discovered about how FMD was introduced into these populations, it’s a significant warning to the U.S. to be on alert.

(Lori Hays)

That was the first time, but not the only time World Pork Expo was canceled. The event was also canceled in 2019 because of the African swine fever outbreak in China and again in 2020 due to the COVID-19 pandemic.

“That was a hard financial decision,” Determan says. “We had just completed the separation agreement between NPPC and the National Pork Board. NPPC was very tightly budgeted at that time, so it was a huge hit.”

However, keeping the U.S. pig herd safe was the most important thing on everyone’s mind. She says they made their decision after hearing reports from veterinarians who had been to England to better understand the extensiveness as well as from the USDA that had sent veterinarians over to help.

“At that time, we didn’t have near the biosecurity practices and things that we do now with the disinfectant foot mats,” Determan says. “We also don’t have live pigs on the on the grounds now compared to how we did things many years ago. We used to have live pigs everywhere on the fairgrounds in the early 2000s from genetics companies with pigs in their displays to the pigs in the live shows.”

The Truth About FMD
The clinical signs of FMD are similar to what the name implies. It can cause vesicles or blisters on the feet, mouth and tongue of animals that are infected. The U.S. has not had a case of FMD since 1929.

“We certainly want to keep it that way, as the economic implications for producers are significant if the virus is introduced,” Niederwerder says.

Compared to many viruses, FMD is a highly stable, non-enveloped virus that allows it to be infectious for longer periods. It’s very contagious and highly transmissible. Not only are there risks with transmission of the virus through infected meat products that may come in through illegal trade, but it can also be carried on contaminated clothes or equipment or supplies of humans.

“The human would not be infected, but certainly people can carry the virus on contaminated clothing,” Niederwerder says. “That’s why it’s really important as we think about prevention of entry into the U.S.”

FMD causes fever and pain. It results in excessive salivation and causes reduced milk production in dairy cattle.

“When you think about the impact, certainly there’s an impact on animal health with regards to the clinical signs, but even further is this impact on trade restrictions and the economic losses for producers,” Niederwerder says. “When you try and contain the virus, that oftentimes results in those infected animals being culled or euthanized so the disease no longer has the chance to spread.”

Why Should the U.S. Pay Attention?
When a virus moves into a new geographical range or is reintroduced into a country that has maintained a negative status for a long period, Niederwerder says it’s critical to reassess the risk to the U.S.

“In January, Germany reported their first case in over 30 years in water buffalo near Berlin,” she explains. “It was 14 animals, and those animals were all culled after the infection was confirmed but certainly trade restrictions and implications on surrounding areas of that Berlin farm were significant.”

Fast forward to March when two additional countries have reported cases. Hungary reported FMD in a single farm of cattle in the north part of the country for the first time in over 50 years. Shortly thereafter, the virus appeared in Slovakia (who also hadn’t seen a case in over 50 years) in multiple herds of cattle.

“Just recently, another herd was a suspect herd in Slovakia, near the southern border near Hungary,” Niederwerder says. “This is certainly concerning about how this virus is being reintroduced. Is it associated with contaminated fomites that may be in the country or traveling to new locations? Is it associated with wild boar? Could it be associated with infected hay?”

Although there is still a lot to be discovered about how FMD was introduced into these populations, it’s a significant warning to the U.S. to be on alert .

“We need to do everything we can to make sure it doesn’t get reintroduced into the U.S.,” Niederwerder says. “How can we amp up any biosecurity measures that are necessary to reduce our risk? We also need to think about reducing the risk of introduction into our country through travel and illegal trade.”

Be on Alert
Livestock operations should reevaluate biosecurity protocols. If any of your farm’s employees travel to areas where there are infected animals, implement a quarantine period for entry back into your U.S. farm, she advises.

“Be vigilant,” Niederwerder urges. “One of the challenges of FMD is that it does cause these characteristic lesions of vesicles or blisters on the mouth, nose or the hoof. What becomes very tricky is that those clinical signs are indistinguishable from other vesicular diseases such as Senecavirus A. If producers and veterinarians see these lesions, they must report it immediately so it can be investigated and confirmed that it is not FMD virus.”

FMD is not just a disease of pigs and cattle, she points out. Sheep, goats and cloven-hoofed zoo animals may also be impacted by FMD. This increases the breadth of what the industry needs to monitor.

“The world is very small now,” Niederwerder says. “Not only do people travel more internationally, but animals move around more than ever, too. It’s extremely important for those of us that are producers to keep our eyes open and pay attention to what’s going on worldwide so we can be as prepared as possible for any change in disease risk.”

That’s one of the ways that SHIC is trying to help producers. SHIC provides timely domestic and global disease updates to producers.

“Watching the SHIC global disease report is really important for producers,” Determan says. “It comes out every month and really gives you a feel for what’s happening in the entire world from a swine health standpoint. The biggest lesson we learned from the 2001 FMD outbreak is that looking farther out than just our own farm gate is so important.”

Keep Reading:
An Update on Foot-and-Mouth Disease Virus Serotype O in Germany

Hungary Confirms Foot-and-Mouth Disease Outbreak in Cattle

Slovakia Records First Foot-and-Mouth Cases, Minister Says

Is the Swine Industry Ready for H5N1? Texas Veterinarian Says “No”

Fri, 21 Mar 2025 20:26:37 GMT

Nearly one year ago, USDA made a shocking announcement. Highly pathogenic avian influenza type A H5N1 (H5N1) was identified in milk and in cows on two dairy farms in Texas and two dairy farms in Kansas. A disease no veterinarian had previously feared in cattle had jumped from wild birds to domestic cows.

Scanlon Daniels, a large animal veterinarian with Circle H Headquarters in Dalhart, Texas, received a call 10 days prior to that announcement that he will never forget from one of his dairy clients that something wasn’t right with some of the cows.

“My client sent me a text: ‘I think I might have it,’” Daniels says.

He went out to the dairy, collected samples from four cows and submitted them to Texas A&M Veterinary Medical Diagnostic Laboratory (TVMDL) as any good swine vet would do, he explained, during the American Association of Swine Veterinarians annual meeting. He also took some nasal swabs and tested those in his own lab. He did a follow-up, collecting samples from 20 different cows later on that week and sent those to the Iowa State University Veterinary Diagnostic Lab.

The four cows that initially presented symptoms of decreased rumination, decreased activity and nasal discharge were eventually confirmed to have H5N1. Right around that same time, he said there were reports from Texas Animal Health Commission about a backyard poultry flock in the county next door diagnosed with H5N1.

Scanlon Daniels shares his experience with H5N1 in Texas.

(Jennifer Shike)

“We had a suspicion that it could have been influenza, because of what was going on with some of the detections in birds in that area,” Daniels says. “But from my standpoint, I was thinking about flu from all my experiences dealing with it in pigs, and it didn’t present as a primary respiratory pathogen. It presented as a mastitis pathogen. Once we knew to look for it in milk, it was super easy to find, but we had to get over that hurdle to be able to rapidly identify it.”

In the past 15 years, Daniels grew his practice to develop its own laboratory capabilities, conducting PCR and Elisa testing for swine, dairy and beef clients. This, combined with his involvement with H5N1 from before it was even identified as an issue in cattle, caused him to bring up an incredibly important question for the swine industry: Are you ready for H5N1?

Who is Steering the Ship?
To date, H5N1 has been discovered in one pig that was on a hobby farm with H5N1-infected poultry. Although this is considered an isolated incident and hasn’t been discovered in the commercial swine population, it needs to be on everyone’s radar, Daniels says.

Andrew Bowman, DVM, one of the country’s top swine influenza experts, joined The PORK Podcast during a special report on H5N1 last fall. A professor in the Department of Veterinary Preventive Medicine at The Ohio State University, he is well-known for his expertise in swine production medicine, veterinary public health and epidemiology.

“Across the swine industry, we routinely deal with influenza, so we’re pretty well versed in flu,” Bowman says. “But this adds a whole other character to the scene that we really don’t want reassorting with the flu viruses we already have.”

One of the things that makes H5N1 different than other new swine disease outbreaks is that the USDA has jurisdiction over H5 in any animal, so they have the regulatory authority, Daniels says.

“USDA had no rules or regulations around H5 in cattle, and we’re at the same place today in the swine industry,” Daniels adds. “If we were to find H5 in swine, USDA would have the authority and there are no rules or regulations around it.”

This has made the discovery of H5N1 in dairy cattle challenging in the past year, because it’s taken a long time for those regulations to be developed.

“There’s the state and federal aspect of that, where states have autonomy to set their own rules, and then federal rules can come in place that everybody has to abide by,” he points out. “There’s been this slowly evolving plan with a patchwork of regulations by different states. That’s been challenging to keep up with as a veterinarian and a producer.”

The recent COVID-19 pandemic has likely amplified concerns around influenza’s ability to be transmitted from humans to animals and from animals to humans.

“This has resulted in a high concern about influenza being the next COVID. Yes, that could happen. Today it hasn’t to that degree.”

Scanlon Daniels

People are fearful of government influence and interaction, he says.

“No one wanted to be first or second or third to get H5N1 in their dairy cattle – just like no one wanted to be first to get COVID-19. There was a reluctance to test because of the uncertainty of it,” Daniels explains. “People fear government overreach or regulations that wouldn’t be applied in a fair or equal way across the industry.”

The Stakes are High
Everybody has a stake in this issue, Daniels says. The challenge is that everybody comes to it with differing priorities regarding the issues at hand.

The American Association of Bovine Practitioners invited seven different groups that have the ability to provide vaccine to share about their technologies on a webinar. This gave avian and bovine veterinarians alike exposure to their vaccine technology.

“The hard part is getting everybody to agree on what needs to happen,” Daniels says.

But he believes the vaccine question is worth talking about.

“If it was just another influenza, we would have had a vaccine available in a couple weeks, honestly,” he says. “The government has the ability to authorize vaccine use under an emergency use exemption. For all the concerns that have been talked about with export markets, and how people might respond from a trade standpoint, they haven’t been willing to look at that. But if we could use vaccine on an experimental use basis, we would know a lot more by now about the value of that intervention.”

In a USDA update on March 20, Secretary of Agriculture Brooke Rollins said USDA is exploring the viability of vaccinating poultry for highly pathogenic avian influenza. However, Rollins said the use of any vaccine for poultry or any animal species has not been authorized at this time.

“I know there has been some misreporting on that,” Rollins said. “The day we rolled out the plan, I actually talked about the fact that we’re not ready to vaccinate. We need to do some more research, and so that has not changed, but I do look forward to this next process of learning more about getting more research done and perhaps seeing what makes sense for the country moving forward, once that is concluded.”

Another concern on Daniels’ mind is the implication with human health. Influenza A viruses are common in people. They are constantly changing and reassorting.

“Influenza viruses exist and circulate in people all the time,” says National Pork Board chief veterinarian Dusty Oedekoven . “The threat of influenza virus infection is ever present. It’s why healthcare providers recommend people get annual influenza vaccines to prevent against new strains of the virus that are emerging all the time.”

Daniels says the unknown transmission opportunities between humans and animals, especially pigs, can be concerning.

“The transmission from people to pigs is a legitimate concern. As an industry, it might be worthwhile doing some serological surveillance.”

Scanlon Daniels

At a recent bovine practitioners meeting, they surveyed 150 veterinarians and found three of them have had prior exposure to H5N1, he says. Some of those had no contact with dairy or birds.

“It would probably be wise for us to do some serosurveillance to know if people working at hog farms have had some exposure and it hasn’t transmitted yet,” he points out.

For example, his lab had a lot of infected milk come through before they knew what it was.

“My staff had legitimate fears and concerns we had to address,” Daniels says. “Fortunately, we didn’t experience any illness or lost time outside of the normal. That could have been different. We can’t lose sight of the human aspect of it. I am a human, a swine vet and a beef producer, so I can understand several aspects of it from a balanced way.”

Hurdle By Hurdle
At the end of the day, the swine industry has a lot to learn from what the dairy industry experienced in the past year, he says.

“On one hand, we have advantages relative to bovine veterinarians because we have a strong background and applied experience in diagnostics and strong working relationships with state and federal animal health officials,” Daniels says. “We have a mindset of disease elimination when possible and strong integrated relationships with producers. The swine industry also has the ability to direct Pork Checkoff dollars toward research (the dairy industry does not).”

On the other hand, he says many of the factors that have caused consternation will continue to be problematic if HPAI is identified in swine. Studies need to be done looking at H5N1 in swine, he says. If a sow is infected, does it transmit to pigs? Can her pigs shed it to contact controls? How could the movement of wean pigs spread the disease?

He also wonders if pigs have some cross-protective immunity at this point because influenza is pretty much endemic in almost all swine populations. And, even though it presents in the mammary system in cows, he argues the swine industry could do some additional work in growing pigs, because it would be easier to deal with there than on a sow farm.

One of the biggest hurdles is that H5N1 is a select agent. Once samples are known to be positive for H5N1 antigen, there are many requirements related to storage, handling and testing that come into play. Space is limited to research H5N1 and Daniels is concerned at the delay in testing this virus in swine.

“Another challenge is H5N1 is of economic significance to dairy producers but has not been great enough to stimulate much independent industry action.”

Scanlon Daniels

For comparison, the relative economic impact of H5N1 in dairy is estimated to be approximately 10% that of a porcine epidemic diarrhea virus (PEDV) outbreak in swine, he says.

“We have seen growing interest by veterinarians and producers in eliminating H1 and H3 influenza infections in swine, but the interest and adoption is less than what we see for porcine reproductive and respiratory syndrome and PEDV,” Daniels says. “Would we see the same if H5N1 was identified in swine?”

He believes the swine industry still has an opportunity to develop the response to H5N1 in commercial swine before it occurs.

“It’s time to get some of these questions answered that are important to us,” Daniels says. “If it were to happen, we need to be prepared to address some of the risk factors, things that are real versus the fear of the unknown.”

Your Next Read: Influenza Expert Gets Real About the H5N1 Risk to Your Swine Herd

Editor’s Note: On March 12, APHIS confirmed the presence of highly pathogenic avian influenza H7N9 in a broiler chicken breeder flock in Mississippi. APHIS has previously documented H7 low pathogenicity avian influenza in U.S. wild bird surveillance this year and in previous years, but this is the first HPAI H7 case in commercial poultry in the U.S. since 2017. This H7N9 virus is a fully North American virus of wild bird-origin and is unrelated to the Eurasian H5N1 currently circulating in the U.S. Spillovers of avian influenza from wild bird sources can occur due to breaches in biosecurity. APHIS closely monitors these subtypes because H5 and H7 LPAI viruses in poultry species such as chickens and turkeys can mutate into highly pathogenic avian influenza.

Slovakia Records First Foot-and-Mouth Cases, Minister Says

Fri, 21 Mar 2025 13:48:54 GMT

Slovakia has detected cases of foot-and-mouth disease at three farms in the southern part of the country, Agriculture Minister Richard Takac was cited as saying by news website Dennik N and other media on Friday.

The infections are the first in half a century, and come after neighboring Hungary reported cases earlier in March.

Foot-and-mouth disease poses no danger to humans but cause fever and mouth blisters in cloven-hoofed ruminants such as cattle, swine, sheep and goats, and outbreaks often lead to trade restrictions.

(Reporting by Jason Hovet in PragueEditing by Tomasz Janowski)

Your Next Read: Hungary Confirms Foot-and-Mouth Disease Outbreak in Cattle

Foot And Mouth Disease: Producers Should Be Prepared

Trump Administration Shifts Strategy on Avian Flu

Mon, 17 Feb 2025 00:38:30 GMT

The Trump administration is rolling out a new strategy to combat avian flu, moving away from mass culling of infected flocks. Spearheaded by National Economic Council Director Kevin Hassett and USDA Secretary Brooke Rollins, the plan prioritizes enhanced biosecurity measures and medication to control the spread of the virus.

Key Points of the New Strategy

Biosecurity and Medication: Improved containment protocols and medication aim to reduce reliance on widespread culling.
Smart Perimeter Approach: Targeted containment methods will enhance efficiency in preventing outbreaks.
Collaboration: Government scientists and global academic experts are contributing to the plan’s development.

Recent Developments

Vaccine Approval: Zoetis received conditional USDA approval for an avian flu vaccine.
Industry Support: Major poultry and dairy organizations back vaccine use to control the virus.

Concerns and Challenges

Trade Impact: The National Chicken Council warns that vaccinating flocks could hinder poultry exports.
Efficacy of Previous Measures: Critics argue that the Biden administration’s mass culling approach was costly and ineffective.
Ongoing Outbreak: The flu has affected over 150 million birds since 2022, driving up egg prices and causing supply shortages.

Future Outlook

The plan’s success hinges on industry adoption and global trade acceptance. Balancing effective disease control with maintaining poultry exports remains a critical challenge for the administration.

NEC-Led Task Force on HPAI/Egg Prices to Confront Hurdles, Challenges

Hassett is working with industry experts and government analysts and officials, including those at USDA. Secretary Rollins late Thursday heard from various experts on the topic.

The emergence and spread of new avian influenza variants have significantly impacted egg prices, poultry production, and resulted in public health concerns, necessitating ongoing vigilance and adaptive strategies from both the industry and government agencies. Some of the issues:

Background

Bird flu was present during the first Trump administration (2017-2021). Several notable events related to avian influenza occurred during this period:

Outbreaks in 2017

In March 2017, an outbreak of highly pathogenic avian influenza (HPAI) H7N9 virus was detected in two commercial chicken breeder flocks in the United States.
This North American lineage HPAI H7N9 virus was genetically unrelated to the Asian lineage HPAI H7N9 viruses reported in China.

Policy Continuation

A USDA bird flu response plan, updated in May 2017 during Trump’s first administration, incorporated policy guidance based on lessons from influenza outbreaks during the Obama and first Trump administrations. The plan stated that “rapid depopulation of infected poultry is critical to halt virus transmission and must be prioritized.”

Depopulation Strategy

During a March 2017 bird flu outbreak, a USDA report indicated that “nearly 253,000 birds were depopulated.”
This depopulation strategy was a continuation of long-standing practices to prevent bird flu from spreading, as confirmed by agriculture experts.

While bird flu was present during Trump’s first term, the current widespread outbreak affecting cattle and causing human infections began in 2022, after Trump left office. The ongoing situation presents new challenges for the incoming Trump administration in 2025.

The Biden administration faced significant bird flu outbreaks during its tenure, with the H5N1 virus causing widespread impacts across the United States. Here’s an overview of the outbreaks and the actions taken:

Outbreaks

The current H5N1 outbreak began in 2022 and intensified throughout the Biden administration.
By early 2025, the virus had affected over 130 million birds, including both wild and domestic populations.
The outbreak expanded to dairy cattle, with 925 dairy herds across 16 states infected by October 2024.
Human cases were reported, with 67 confirmed cases and one fatality in the U.S. by early 2025.

Actions Taken

The Biden administration and then USDA Secretary Tom Vilsack implemented several measures to address the outbreak:

Funding and Resource Allocation

By January 2025, the administration had spent approximately $1.8 billion battling bird flu since the spring of 2023.
An additional $306 million was allocated in early 2025 for various response efforts.
In May 2024, nearly $200 million was provided to contain the outbreak, with $98 million for dairy farms and $101 million split between the FDA and CDC.

Testing and Surveillance

USDA implemented a Federal Order in May 2024 requiring testing of cattle before interstate movement.
In December 2024, a new mandate was announced to test the national milk supply for bird flu.
Enhanced testing and monitoring strategies were planned to better assess the presence of H5N1.

Biosecurity Measures

Vilsack emphasized the importance of improved biosecurity as a key strategy to limit the spread of H5N1.
USDA announced assistance for producers with H5N1-affected premises to improve on-site biosecurity.

Interagency Cooperation

USDA worked closely with the FDA on lab testing and with the CDC on public health matters.
A response team including four HHS agencies (CDC, FDA, NIH, and ASPR) was established to work with USDA. (ASPR is the Administration for Strategic Preparedness and Response.)

Public Health Initiatives

Funds were allocated to enhance hospital readiness and conduct research on therapeutics, diagnostics, and vaccines.
Local jurisdictions received funding to increase monitoring of high-risk populations, such as livestock workers.

Bottom Line: The above actions demonstrate the Biden administration’s multifaceted approach to addressing the H5N1 outbreak, focusing on containment, research, and protection of both animal and human health. However, despite these efforts, the outbreak expanded to dairy cattle, with 925 dairy herds across 16 states infected by October 2024. Human cases continued to occur, with 67 confirmed cases and one fatality by early 2025. Critics argued that the Biden administration’s response was not swift or comprehensive enough.

Vaccines

They are seen as impractical but could be used in targeted areas. Most available vaccines for avian influenza in chickens are administered through injection. This method, while effective, can be time-consuming and stressful for the birds, especially in large-scale poultry operations.

Currently, there are limited options for vaccinating chickens against bird flu via feed or water, but research is ongoing to develop more convenient methods of vaccine administration

New Variants

The disease is a moving target. USDA under then Secretary Tom Vilsack conditionally approved a vaccine made by Zoetis, containing a killed version of an H5N2 variant designed to work against circulating H5N1 variants. However, the effectiveness of vaccines may be compromised as new variants emerge, potentially requiring frequent updates.

Vilsack, during his tenure as USDA Secretary, took several steps regarding HPAI vaccines, but the situation has evolved over time:

Vaccine approval and funding. In 2016, Zoetis received a conditional license for its H5N1 vaccine and a contract award for the USDA’s National Veterinary Stockpile. This vaccine was approved under Vilsack’s leadership, as he served as USDA Secretary from 2009 to 2017, and then again from 2021 until Jan. 2025.
Vaccine fate. The Zoetis H5N1 vaccine approved in 2016 remained in the National Veterinary Stockpile until 2021 but was never used. This suggests that the vaccine was eventually discarded or removed from the stockpile without being deployed.
In August 2024, Vilsack authorized the first field trial of an H5N1 vaccine for cattle.

Of note: As of February 2025, Zoetis received a conditional license from USDA for its Avian Influenza Vaccine, H5N2 Subtype, Killed Virus, for use in chickens.

USDA has allocated significant funding for HPAI response:

In May 2024, Vilsack approved the transfer of $824 million from the Commodity Credit Corporation to the Animal and Plant Health Inspection Service (APHIS) for HPAI response efforts. This was in addition to a previous approval of $1.3 billion in emergency funds to tackle nationwide HPAI detections.
Former USDA Secretary Vilsack revealed that USDA was accelerating vaccine production for bovines, with seven potential vaccine candidates in development.

While not yet widely available, some alternative methods for vaccinating chickens against bird flu are being explored:

Spray vaccination: Some researchers have evaluated immune responses in chickens vaccinated via coarse spray with adenovirus-vectored avian influenza vaccines. This method shows promise for mass immunization of poultry, potentially eliciting both systemic and mucosal immune responses.
Drinking Water: As of now, there are no available vaccines that can be delivered through drinking water for avian influenza. However, this route of administration is being researched as a potential method for mass vaccination.
Aerosol/Spray: Only one vaccine is currently available for aerosol/spray administration. This method could potentially allow for easier mass vaccination of poultry flocks.

Challenges

The development of vaccines suitable for mass application methods outside hatcheries, such as via drinking water or spray/aerosolization, is still in progress. These methods would greatly simplify the vaccination process for large-scale poultry operations. Researchers are working on various approaches to make vaccination more practical:

Vectored vaccines: Some vaccines use viral vectors, like adenoviruses, to deliver avian influenza antigens. These may be more amenable to alternative administration routes.
Mucosal immunity: Spray and aerosol methods are being explored to target mucosal immune responses, which could provide better protection against respiratory infections like avian influenza.

Of note: While progress is being made, as of now, most approved and effective vaccines for avian influenza in chickens still require injection. The development of feed- or water-based vaccines remains an active area of research in the poultry industry.

Another Issue:

Changing variants of avian influenza significantly impact the egg price situation and overall poultry industry. Here’s how:

Emergence of New Genotypes. A new genotype of avian influenza, D1.1, emerged in wild migratory birds in September 2024 and subsequently spread to domestic poultry. This new variant has had severe consequences:

Increased spread across North America’s four migratory waterfowl flyways.
Spillover into poultry, humans, and even cows.
Caused a severe flu case in British Columbia and a death in Louisiana.
Scientists announced they found D1.1 in infected dairy cattle in Nevada for the first time. A dairy farm worker tested positive for H5N1, the state’s first reported human case.
Some scientists fear the D1.1 variant carries a new mutation that helps the virus copy itself more easily onto the cells of mammals, including humans.
Some scientists suspect a new strain is spreading via dust from bird droppings, carried by the wind.

Impact on Poultry and Egg Production.

The emergence of new variants has led to:

More than 20 million egg-laying chickens in the U.S. died in the last quarter due to the bird flu outbreak. This figure includes both chickens that died from the virus and those that were culled to prevent further spread of the infection. This recent toll represents the most severe impact on America’s egg supply since the outbreak began in 2022.
Reduction in the conventional egg-laying flock by 3.7% in January 2025 alone.
Significant drop in egg production, falling to 9.1 billion dozen in 2022 from 9.4 billion dozen in 2019.
The losses have affected all major production systems, including conventional caged, cage-free, and certified organic types (with some major differences as noted below).
Egg prices have soared to their highest levels in years, largely driven by the virus (details below).
The U.S. egg industry now has 8% fewer egg-laying hens than it did three years ago.
The federal government has allocated substantial funds to compensate farmers, with USDA spending $1.25 billion on payments to farmers since the outbreak started in 2022.
New bird flu outbreaks have also struck major egg-laying operations in Indiana and Georgia, leading to heists of the precious commodity and the sight of empty supermarket shelves where cartons of eggs should be.
New York Governor Kathy Hochul recently ordered all live-bird markets in New York City and some surrounding areas to shut down for a week to stem the spread of the virus. Three ducks at the Queens Zoo died of bird flu and as many as 12 birds at the Bronx Zoo that died after possible exposure are being tested for the virus.

The bird flu outbreak has significantly impacted the availability of organic and cage-free eggs, though in some unexpected ways:

Impact on Organic Egg Production

Less affected: Organic egg production has been less impacted by the bird flu outbreak compared to conventional egg production.
Smaller flocks: Organic egg-laying hens typically live in smaller flocks with more spacious conditions, which may contribute to their lower infection rates.
Price stability: Organic egg prices have been relatively more stable due to different pricing practices, with producers often setting long-term strategic prices with retailers.

Cage-Free Egg Availability

Disproportionate impact: Despite representing only about a third of U.S. egg layers, cage-free hens contributed to nearly 60% of all bird flu cases in 2024.
Supply challenges: The disproportionate impact on cage-free flocks has led to significant supply issues, especially in states with cage-free egg laws.
Recovery difficulties: Rebuilding cage-free flocks can be more challenging due to fewer sources and stricter regulations in some states.

Market Dynamics

Pricing anomalies: In some areas, like New York City, organic and cage-free eggs have been priced lower than conventional eggs due to existing contracts.
Potential price increases: As contracts expire, prices for organic and cage-free eggs may increase significantly.
State regulations: Nine states, including California and Colorado, have laws requiring eggs to be from cage-free hens, further complicating supply issues.

Other Issues:

Cage-free transition: About 40% of U.S. commercial egg layers are now in cage-free systems, up from just 30 million in 2015.
Supply/demand imbalance: The growth in cage-free egg demand has outpaced supply, exacerbated by bird flu outbreaks.
Bottom line: While organic eggs have been somewhat less affected by the bird flu outbreak, cage-free egg production has faced significant challenges. This has led to complex market dynamics, including unexpected pricing patterns and potential future shortages, particularly in states with cage-free egg laws.

Economic and Trade Implications.

Changing variants can affect international trade and economic stability:

The presence of highly pathogenic avian influenza (HPAI) restricts international trade in live birds and poultry meat.
New variants may lead to more stringent trade restrictions, further impacting national economies.

Human Health Concerns

As the virus evolves, there are increasing concerns about human health:

The D1.1 genotype has infected humans, with 68 confirmed cases and one fatality in the United States.
Experts worry that as the virus replicates, the chance of a mutation allowing human-to-human transmission increases.

Egg Prices

Egg prices in the United States have reached unprecedented levels, with the average cost of a dozen Grade A eggs hitting a record high of $4.95 in January 2025, but prices in individual states and stores can be much higher or lower. This represents a significant increase from previous years, with prices nearly doubling since 2024. The surge in egg prices has been particularly dramatic, with a 15% increase from December 2024 to January 2025 alone.

Several factors have contributed to the soaring egg prices:

Avian influenza outbreak: The primary driver of the price increase is an ongoing outbreak of highly pathogenic avian influenza (HPAI) that began in 2022. This outbreak has led to the culling of millions of chickens, significantly reducing the egg-laying population.
Supply chain disruptions: The bird flu epidemic has caused severe disruptions in the egg supply chain, with the population of conventionally caged chickens reduced by 8%.
Supply/demand imbalance: Consumer demand for eggs has remained steady despite the price increases, contributing to the supply-demand imbalance.
Shift in consumer preferences: There has been a growing preference for specialty eggs, such as cage-free and organic varieties, which are typically more expensive.
State Regulations: Some states, like California, have implemented stricter regulations requiring eggs to be sold from cage-free hens, further impacting prices.

Impact on consumers and businesses. The egg price surge has had widespread effects:

Grocery store limitations: Some grocery chains, including Trader Joe’s and Kroger, have placed limits on the number of eggs customers can purchase.
Restaurant surcharges: Restaurants like Waffle House have implemented per-egg surcharges to offset the increased costs.
Regional price variations: Prices vary significantly by region, with some areas seeing even higher costs. For example, in California, a carton of two dozen eggs can cost $13.49.

Egg Price Outlook

USDA predicts that egg prices could rise by up to 20% in 2025. The duration of high prices remains uncertain, as it depends on controlling the spread of avian flu and replenishing the egg-laying chicken population.

Experts suggest it may take at least another three to six months before prices begin to moderate. But some analysts say if a way can be found to deal with HPAI, egg prices would tumble. As consumers grapple with these high prices, some are adapting by reducing egg consumption or seeking alternatives. The situation continues to evolve, with both political and economic implications as the country faces this ongoing challenge in the food supply chain.

Does the U.S. import and export eggs? Yes.

Total egg exports from the U.S. in 2024 amounted to 172.8 million dozen eggs. This figure includes both table eggs and egg products (converted to shell egg equivalent). Breaking this down further:

Table egg exports: 84.3 million dozen
Egg product exports: 24,834 metric tons
The total value of egg exports in 2024 was $314.2 million, an increase of 5.9% compared to 2023.
In 2023, the U.S. exported $144.9 million worth of eggs, making it the 6th largest exporter globally. The U.S. maintains a positive trade balance in eggs, with exports exceeding imports by $139.6 million in 2023.

Imports

In 2023, the U.S. imported $110.15 million worth of eggs, primarily from Canada, the Netherlands, and the United Kingdom.

The U.S. generally is a net exporter of eggs, with exports significantly outweighing imports.

The top egg-exporting countries globally in 2023 were:

Netherlands: $610.1 million (20.5% of global egg exports)
Poland: $463.4 million (15.6%)
Turkey: $224.5 million (7.5%)
Mainland China: $222.8 million (7.5%)
Germany: $181.5 million (6.1%)

The import of eggs into the U.S. is subject to strict regulations, including requirements for USDA import permits, veterinary health certificates, port inspections, and import quarantines. These measures ensure the safety and quality of imported eggs entering the U.S. market.

The U.S. gov’t has several potential options to address the rising egg prices:

Regulatory Actions

Investigate price gouging: The Federal Trade Commission (FTC) could investigate potential antitrust violations or price gouging in the egg industry. Some lawmakers have urged the FTC to probe egg producers for potentially coordinating efforts to restrict supply and sustain inflated prices.
Ease FDA regulations: The National Chicken Council (NCC) has petitioned the FDA to modify policies that force the broiler industry to destroy safe, nutritious eggs. Relaxing these regulations could increase egg supply and potentially lower prices. The issue stems from a 2009 FDA rule known as the Shell Egg Rule, which requires all shell eggs to be refrigerated at or below 45°F within 36 hours of being laid. This rule, intended for table eggs, inadvertently affects surplus broiler hatching eggs. Broiler eggs intended for hatching must be stored at 65°F for up to five days before determining which eggs are needed for hatching. This process is incompatible with the FDA’s refrigeration requirements, forcing the broiler industry to discard surplus eggs instead of sending them to egg breakers for processing into liquid egg products.

The NCC has requested FDA to: Exercise enforcement discretion to allow surplus broiler eggs to be processed into egg products under USDA Food Safety and Inspection Service (FSIS) jurisdiction; Exempt surplus broiler hatching eggs intended for breaking from the refrigeration requirements in the Shell Egg Rule. NCC argues that the current policy results in significant waste, costing the broiler industry over $27 million annually. Allowing these eggs to be used would help alleviate egg shortages and high prices, especially during events like the recent highly pathogenic avian influenza (HPAI) outbreak. The eggs would be safe for consumption as they would be pasteurized during processing, which is effective in controlling Salmonella.

As of February 2025, FDA has not yet granted the NCC’s request. The FDA denied a similar request on June 12, 2023, stating that the proposed action would not maintain the same level of public health protection as the current egg safety rule.

Policy Interventions

Address avian flu outbreak: The government could allocate more resources to combat the ongoing bird flu crisis, which has significantly impacted poultry populations and egg production since 2022.
Implement price controls: While controversial and unlikely under the Trump administration, the government could consider temporary price controls on eggs to limit further increases.
Increase imports: Easing restrictions on egg imports could help supplement domestic supply and potentially lower prices.

Economic Measures

Provide subsidies: The government could offer subsidies (incentives) to egg producers to offset increased production costs and encourage greater supply.
Offer consumer relief: Implementing targeted financial assistance or tax credits for low-income families could help offset the impact of high egg prices.

USDA has several potential measures to stabilize egg prices:

Enhance biosecurity: Promote and enforce stricter biosecurity measures across poultry farms to prevent the spread of highly pathogenic avian influenza (HPAI).
Increase surveillance: Improve monitoring and early detection of HPAI outbreaks to minimize their impact on egg production.
Investigate price gouging: Collaborate with the Federal Trade Commission and Department of Justice to scrutinize potential anti-competitive practices in the egg industry.
Enhance price discovery: Implement new regulations to improve fairness and transparency in pricing mechanisms for poultry farmers.
Promote competition: Support smaller egg producers and encourage market diversification to reduce reliance on large conglomerates.
Expedite flock replacement: Facilitate faster repopulation of laying hen flocks after HPAI outbreaks.
Address labor shortages: Develop programs to alleviate workforce issues in the egg industry that hamper production.
Ease import restrictions: Consider temporary measures to increase egg imports and supplement domestic supply.
Implement purchase limits: Encourage retailers to set temporary limits on egg purchases to prevent panic buying and ensure fair distribution.
Monitor retail practices: Scrutinize grocery stores’ pricing strategies and promotional activities to prevent unjustified price hikes.
Invest in research: Fund studies on HPAI-resistant poultry breeds and alternative production methods to increase resilience in the egg industry.
Improve forecasting: Enhance data collection and analysis to better predict and prepare for future supply chain disruptions.

Challenges and Limitations

Government intervention in markets can have unintended consequences. Additionally, some factors contributing to high egg prices, such as inflation and increased production costs, may be beyond the government’s immediate control.

President Donald Trump, who campaigned on promises to lower food prices, is facing pressure from lawmakers to act. However, no specific plan has been announced to address the egg price crisis, but NEC Director Kevin Hassett has signaled that a plan is coming, which was released on Sunday.

Cattle and Bison Imports from Mexico to Resume Under New Protocols

Mon, 03 Feb 2025 14:46:37 GMT

On Feb. 1, the United States Department of Agriculture’s Animal and Plant Health Inspection Service (APHIS) announced cattle and bison imports from Mexico will resume utilizing new preventative measures. Imports are scheduled to begin in the next several days.

In November 2024, APHIS halted shipments of Mexican cattle and bison after a positive detection of New World screwworm (NWS) in southern Mexico.

According to the release, APHIS and Mexico agreed to and implemented a comprehensive pre-clearance inspection and treatment protocol to ensure safe movement and mitigate the threat of NWS. APHIS says its top priority is to protect American livestock from foreign pests.

Newly released preventative measures include:

Mexico identified and prepared pre-export inspection pens in San Jeronimo, Chihuahua, and Agua Prieta, Sonora, which APHIS visited, inspected, and approved.
Cattle and bison will be inspected and treated for screwworm by trained and authorized veterinarians prior to entering the pre-export inspection pens, followed by inspection by Mexican officials before proceeding to final APHIS inspection before crossing at the Santa Teresa and Douglas Ports of Entry, respectively.
Cattle and bison approved for importation will also be dipped in a solution to ensure they are otherwise insect- and tick -free.

The United States and Mexico are working closely to approve additional pre-export inspection pens and reopen trade through other ports of entry, the release says.

APHIS will continue working with partners in Mexico and Central America to eradicate NWS from the affected areas and to reestablish the biological barrier in Panama, which has been maintained since 2006.

In the last two years, screwworm has spread north of the barrier throughout Panama and into Costa Rica, Nicaragua, Honduras, Guatemala, El Salvador, Belize and now Mexico.

The APHIS release says the increase is due to multiple factors including new areas of farming in previous barrier regions for fly control and increased cattle movements into the region.

APHIS is releasing sterile flies through aerial and ground release at strategic locations, focusing on Southern Mexico and other areas throughout Central America.

A complete list of regions APHIS recognizes as affected by screwworm as well as more detailed information on trade restrictions can be found on the USDA APHIS Animal Health Status of Regions website .

New Study Says Domestic Cats Need To Be Evaluated More For HPAI H5N1 Implications

Mon, 13 Jan 2025 21:07:11 GMT

Dairy cattle have garnered most of the agriculture industry’s attention in the past year, with regard to outbreaks of the highly pathogenic avian influenza A (HPAI) H5N1.

Now, some researchers are turning their attention to other animals on the farm impacted by the virus: cats.

A new study published Monday in the journal Emerging Microbes & Infection addresses how domestic cats are affected by the virus and notes concerns such felines could offer the potential for HPAI H5N1 to evolve into a more dangerous version of the virus.

The study – which addresses the deaths of 10 cats in rural South Dakota last April – is not the first time researchers have raised concerns about the virus in cats and the potential for transmission to other mammals.

‘Urgent Need For Surveillance’
Researchers at the University of Maryland School of Public Health said in June 2024 that a “20-year review of bird flu in felines suggests urgent need for domestic cat surveillance.”

Kristen Coleman, an assistant professor in the UMD School of Public Health, and an affiliate professor in the University of Maryland Department of Veterinary Medicine, said, “As companion animals, domestic cats provide a potential pathway for avian influenza viruses to spillover into humans.” (Researcher Warns Pet Cats Risk Getting Bird Flu)

“We looked at the global distribution and spread of bird flu infections in feline species between 2004 and 2024 and found a drastic rise in reports of feline infections starting in 2023, with a spike in infections reported among domestic cats, as opposed to wild or zoo-kept animals,” added Coleman, who was not involved in the South Dakota study.

There is no study that shows transmission occurs from HPAI H5N1-infected cats to humans. Furthermore, current research shows HPAI H5N1 does not readily spread among humans, though studies have noted one or two key mutations could change that fact.

The virus often does take a deadly toll on felines. According to the University of Maryland’s School of Public Health , infected domestic cats have a mortality rate of up to 67%.

Last week, the Cornell University College of Veterinary Medicine Animal Health Diagnostic Center published directions online for veterinarians testing cats for highly pathogenic avian influenza (HPAI) .

AVMA Weighs In
“Dozens of cats are known to have contracted the virus, including barn and feral cats, indoor cats, and big cats in zoos and in the wild (e.g., mountain lions, tigers, leopards, and bobcats),” according to the American Veterinary Medical Association (AVMA). “Cats were already known to be susceptible to the H5N1 virus, with several feline cases linked to poultry or wild bird exposure before the cattle outbreak began,” AVMA said.

See Avian influenza A (H5N1) in cats for the Association’s recommended practices for dealing with any suspected of being infected by the virus.

‘A Possible Link’ To Local Cattle
The study published on Monday said virus-infected birds could have played a role in the South Dakota felines’ demise.

In addition, the report said: “The exact source of infection remains unclear; however, phylogenetic analysis of H5N1 sequences from two of the cats reveals a close genetic relationship to clade 2.3.4.4b strains previously detected in local cattle, suggesting a possible link.

“Additionally, the presence of bird feathers near the deceased cats indicates the likelihood that infection may have occurred through the consumption of virus-infected birds. However, because the disease typically requires several days to manifest post-ingestion, the exact timing of exposure is unclear. This evidence points toward a plausible cattle-to-bird-to-cat transmission pathway, supported by recent studies that identified H5N1 sequences across multiple species on affected farms, including dairy cows, wild birds, domestic cats, and raccoons.”

Many Mammal Species Impacted
According to USDA-APHIS, more than 200 mammal species in the U.S. have been infected by the virus since 2022.

Along with cows and cats, other U.S. mammals infected with the virus include a bottlenose dolphin, foxes, bobcats, mountain lions, coyotes, skunks, harbor and grey seals, opossums, squirrels, minks, otters, black bears, brown bears, polar bears, and a single pig on a backyard farm in Oregon, confirmed in late October.

The CDC encourages veterinarians and other individuals working with cats or other mammals that are suspected or confirmed positive for HPAI H5N1 to take precautions to prevent potential unprotected exposures.

The agency offers additional direction here: Highly Pathogenic Avian Influenza A(H5N1) Virus in Animals: Interim Recommendations for Prevention, Monitoring, and Public Health Investigations .

Your next read: California Issues New Ban on Dairy Cattle and Poultry Shows in Response to H5N1 Bird Flu

I'm Going Into 2025 With Increased Concerns About HPAI H5N1

Thu, 02 Jan 2025 15:14:49 GMT

As we leave 2024 behind and start the New Year, the U.S. needs to step up its efforts to stop the spread of HPAI H5N1 — for all our sakes.

Based on the official numbers of virus cases reported in the dairy industry and beyond, in poultry and wildlife, it doesn’t appear we are moving fast enough individually or collectively to rein in this virus.

I’m trying to tread lightly on this topic, but candidly, I’m afraid.

The Impact On People

I’m very concerned about what this virus has the potential to do to human beings — our dairy farmers, farm workers, veterinarians — and, yes, the rest of us.

While the Centers for Disease Control and Prevention (CDC) says the “current risk to individual and population health remains low in the U.S.,” that statement is less reassuring to me as time marches on and the virus spreads.

As of Dec. 30, 2024, the CDC has confirmed “only” 66 cases of the virus in people. See H5 Bird Flu: Current Situation.

That number is likely very low, based on what veterinarians have told me since March 25, 2024, when the virus was first confirmed in dairy cattle.

More importantly, consider what scientists are saying.

The American Veterinary Medical Association (AVMA) reported on Dec. 30 that “the virus strain found in dairy cows in the U.S. may only need one mutation for it to be able to spread among humans, according to a study published in the journal Science in early December.”

Dr. Les Sims, a veterinary consultant who has worked internationally for over 30 years on the prevention and control of major infectious diseases of food-producing animals, warns in the article: “The longer this virus circulates unchecked, the higher the likelihood it will acquire the mutations needed to cause a pandemic. We need to act urgently to prevent this scenario.”

The AVMA’s complete article is available here:
Novel bird flu strain continues to threaten animal, public health

Virologists Share Their Perspectives
Another insightful article is The state of H5N1 infections and research as 2025 approaches, posted on Dec. 24 by Chemical & Engineering News. It notes:

“As more cows get infected with H5N1 bird flu, and more people get exposed to infected animals, there’s increased opportunity for the virus to evolve into a version that’s more capable of spreading between people,” says Ed Hutchinson, a virologist at the University of Glasgow. “The process could result in the virus accumulating mutations that allow for better replication and transmission, including between people.”

“Virologists are also concerned about a situation where a person simultaneously gets infected with H5N1 and human influenza virus H3N2 or H1N1, each of which is currently circulating as flu activity gains pace . But it’s hard to predict whether genetic reassortment between those viruses would create a version of H5N1 that’s more adept at spreading in humans,” says Richard Webby, an influenza virologist at St. Jude Children’s Research Hospital, in the Chemical & Engineering News article.

Consider what one physician told NBC News Science Reporter Evan Bush on Dec. 23:

“The traffic light is changing from green to amber,” said Dr. Peter Chin-Hong, a professor of medicine at the University of California, San Francisco, who studies infectious diseases. “So many signs are going in the wrong direction.”

See Bird flu warning signs are going in the wrong direction

Impacts In Dairy, Poultry, Wildlife
The virus continues to spread in the dairy industry, and it’s alarming the toll it’s already taken in domestic poultry and wildlife. In summary:

In Dairy: On March 25, 2024, the USDA, CDC and FDA made their official confirmation of the virus in dairy herds in two states, Texas and Kansas. A short nine months later, on Dec. 30, 2024, we officially had 913 herds affected in 16 states, according to the CDC. See Domestic Summary.

In Poultry: the USDA says HPAI H5N1 outbreaks in poultry have been detected in all 50 states —1,324 commercial flocks and 729 backyard flocks—resulting in the depopulation of more than 125 million turkeys and chickens. See the Full Report .

In Wildlife: The virus has affected more than 200 wildlife species across the U.S. See Detections of Highly Pathogenic Avian Influenza in Mammals.

Do What You Can
I don’t want to experience “another Covid” or a virus that could be even worse. I’m sure no one else does, either.

We must act individually and collectively to stem the spread of HPAI H5N1.

Please don’t “kick the can” on down the road and expect someone else to do your part. Take the steps you can to help, however small they might be.
That’s what I’m trying to do, too.

HPAI H5N1 is Content Focus of Special Issue

A Message to the Ag Industry about H5N1

California Issues State of Emergency Warning in Response to More Bird Flu Found on Dairies

New Zealand Reports First Case of HPAI

USDA Reports First H5N1 Detection in Swine

Navigating HPAI: Supporting Producers and Safeguarding Cows

Emergency USDA Funding Available to Protect U.S. Livestock and Animals from New World Screwworm

Fri, 13 Dec 2024 18:09:22 GMT

On Dec. 13, the United States Department of Agriculture’s Animal and Plant Health Inspection Service (APHIS) announced $165 million in emergency funding from the Commodity Credit Corporation to protect U.S. livestock and other animals from New World screwworm (NWS) and to increase USDA’s ongoing efforts to control the spread of NWS in Mexico and Central America. NWS are fly larvae that infest living tissue of warm-blooded animals, causing infection, according to an agency release.

NWS has spreadout throughout Panama and into Costa Rica, Nicaragua, Honduras, and Guatemala during the last two years. With the finding of a NWS-positive cow found in Mexico on Nov. 22, APHIS and Mexican authorities have taken additional measures to prevent further spread through surveillance, animal health checkpoints and domestic preparedness. In addition, USDA is working with partners in Mexico and Central America to establish a barrier on the Isthmus of Tehuantepec, eradicate NWS from the affected areas, and reestablish the biological barrier in Panama.

“The current outbreaks in Central America demonstrate the need for USDA to increase its investment in NWS eradication and prevention,” says Jenny Lester Moffitt, USDA Under Secretary for Marketing and Regulatory Programs. “If NWS were to spread to the United States, it would result in significant economic losses and threats to animal health and welfare. This funding will allow for a coordinated emergency response to control the outbreak and prevent NWS from spreading to the United States.”

APHIS asks all producers along the southern border to watch their livestock and pets for signs of NWS and immediately report potential cases to their local veterinarian, State Veterinarian’s Office, or APHIS Veterinary Services.

According to APHIS, eradicating NWS is only possible through sterile insect technique. With this method, sterile flies are released into an area where a known population has become established. The sterile male screwworm fly mates with fertile female screwworm fly, causing the population of screwworm flies to decrease until it eventually dies out.

To learn more about NWS, visit the APHIS website .

Read more: Texas Tech Veterinarian Weighs In On New World Screwworm

New World Screwworm: Latest Update from USDA-APHIS

APHIS Increases Import Restrictions on Animal Products from Mexico on Confirmed Case of New World Screwworm

Preempting African Swine Fever in Texas with Research

Mon, 09 Dec 2024 13:42:49 GMT

By Gabe Saldana

As feral hog populations increase in Texas and the U.S., they create desirable conditions for disease-carrying ticks and increase the risk for an outbreak of African swine fever virus, ASFV.

To ensure the devastating ASFV stays out of Texas and the Southern U.S., a multi-institution research project led by Texas A&M AgriLife Research will assess the potential, or vector competency, of a southern Ornithodoros turicata tick to transmit the disease.

The nearly $1.5 million project is supported by the U.S. Department of Homeland Security Science and Technology Directorate through Cross-Border Threat Screening and Supply Chain Defense, CBTS, a DHS Center of Excellence within AgriLife Research.

Results from the project will fill critical knowledge gaps in the vector competency of ticks in the U.S. It will be an early key step toward research-based solutions that keep Texas and the Southern U.S. free of ASFV.

Assessing tick vector competency for ASFV transmission in Texas
“These ticks are in several southern states and are common in Texas,” said Meriam Saleh, Ph.D., clinical assistant professor in the Texas A&M College of Veterinary Medicine and Biomedical Sciences. Saleh is the project’s principal investigator.

“Laboratory studies using a subspecies of these ticks, which originated in Florida, demonstrated high vector competency for ASFV to pigs,” she said. “Our research aims to confirm whether the Texas ticks carry the same ability to transmit the disease.”

Dee Ellis, DVM, AgriLife Research veterinarian within the Texas A&M College of Agriculture and Life Sciences Department of Entomology., and Scott Kenney, Ph.D., of Ohio State University, join Saleh as co-principal investigators.

The team will evaluate the biology and transmissibility of different ASFV strains and genotypes in ticks. They will determine the ability of other species to host or spread ASFV from ticks in the U.S.

Preempting an outbreak with research
African swine fever, as its name suggests, is a tick-borne DNA virus originating in Africa, where Ornithodoros moubata ticks persist in a continuous cycle with wild warthogs.

In Texas, unique challenges come from a host of issues: the presence of potential tick vectors, the expanding feral swine population, expansive suitable habitat for ticks and feral swine, commercial swine operations and the U.S. border with Mexico among others.

The USDA Animal and Plant Health Inspection Service estimates that an ASFV outbreak in the U.S. would devastate the U.S. pork industry with a 50% drop in hog prices, a halt in pork and pork product exports, as well as significant job losses and culling of the animals.

In Texas, according to the Texas Pork Producers Association, feral pigs outnumber domestic swine at least 3-to-1.

Adult ticks have been documented to live for years between feedings. Several species of Ornithodoros ticks in North America have demonstrated African swine fever transmission to swine in laboratory settings.

“Leading-edge discoveries and innovation will be the keys to staying ahead of ASFV for Texas and the Southern U.S.,” said Heather Manley Lillibridge, Ph.D., executive director of CBTS. “Collaborations across multiple institutions provide us with the resources and expertise for continued success.”

Your Next Read: The Pork Industry Responds to EPA’s Rodenticide Strategy

Texas Tech Veterinarian Weighs In On New World Screwworm

Fri, 06 Dec 2024 13:26:40 GMT

USDA’s Animal and Plant Health Inspection Service (APHIS) has heightened import restrictions on animal products from Mexico since detection of New World Screwworm in a Mexican cow on Nov. 22. It has also intensified efforts in Central America to contain the spread of New World screwworm. Animal health experts say it’s warranted as it’s a significant threat to U.S. animal health.

“It can have a huge impact, certainly an economic impact, because it decreases the health and wellness of our livestock,” says Jennifer Koziol, associate professor of food animal medicine and surgery, Texas Tech School of Veterinary Medicine. “We’re thinking about loss of animal use, and certainly thinking about our wildlife populations that could be decimated by this disease.”

The pest can infest any warm-blooded animal, including humans.

“The screwworm fly lies its eggs in an open wound on the animal,” Koziol says. “These larvae or worms just eat the flesh of that animal. It can be devastating to any animal that becomes infected with screwworm.”

Koziol advises producers to monitor herds, especially in the southern U.S., and use preventative measures, including sterile fly introduction or animal health products.

“It looks like Doramectin has about a 28-day efficacy period against this,” she adds. “Ivermectin is similar. We’re looking at those products and how we can use them as an aid in preventing disease.”

According to APHIS, it appears this case is isolated, which leaves the cattle industry asking when will the border restrictions ease for Mexican cattle and product imports.

Koziol says the border could likely open after Christmas or around the first of January.

“We’re working really hard to set up some pre-export pens that APHIS will go in and OK and feeling very good about the protocols set in place,” she adds.

Impact on Cattle Prices
Market analysts say when the border reopens it might hurt cattle prices in the South more than the North.

“They could break a little bit, but I think the reality of the deal is it looks like there’s enough people out there who believe that ownership is the key when it comes to having some cattle around them as tight supplies are very, very tight of yearling-type steers,” says Brad Kooima, Kooima Kooima Varilek. “That’s going to still put a prop underneath the thing because the cash index is so strong.”

The price impact will likely be short lived.

Read more: New World Screwworm: Latest Update from USDA-APHIS

APHIS Increases Import Restrictions on Animal Products from Mexico on Confirmed Case of New World Screwworm

USDA Reports First H5N1 Detection in Swine

Wed, 30 Oct 2024 19:05:00 GMT

USDA announced on Oct. 30 the first reported case of H5N1 in a pig in an Oregon backyard farm. It’s important to note there is no concern about the safety of the nation’s pork supply as a result of this finding, USDA said. This farm is a non-commercial operation, and the animals were not intended for the commercial food supply.

“The confirmed case in Oregon poses no threat to consumer health or food safety; properly handled and cooked pork products remain safe for consumption,” Bryan Humphreys, National Pork Producers Council (NPPC) CEO said in a statement. “The entire pork industry remains committed to safeguarding food safety and human and animal health.”

The case was discovered on a backyard farm that includes a mix of poultry and livestock, including swine. The Oregon Department of Agriculture announced on Friday, Oct. 25, that poultry on this farm represented the first H5N1 detection in Crook County, Oregon. On Tuesday, Oct. 29, the USDA National Veterinary Services Laboratories also confirmed one of the farm’s five pigs to be infected with H5N1, marking the first detection of H5N1 in swine in the U.S., USDA reports.  

“The livestock and poultry on this farm shared water sources, housing, and equipment; in other states, this combination has enabled transmission between species. Although the swine did not display signs of illness, the Oregon Department of Health and USDA tested the five swine for H5N1 out of an abundance of caution and because of the presence of H5N1 in other animals on the premises,” USDA wrote.

The swine were euthanized to facilitate additional diagnostic analysis. Although test results were negative for two of the pigs, and test results are still pending for two others.  
The farm has been quarantined to prevent further spread of the virus. Other animals on the farm include sheep and goats that remain under surveillance.  

“USDA’s National Veterinary Services Laboratories (NVSL) has conducted genomic sequencing of virus from the poultry infected on this farm, and that sequencing has not identified any changes to the H5N1 virus that would suggest to USDA and CDC that it is more transmissible to humans, indicating that the current risk to the public remains low,” USDA wrote.

H5N1 detections include viral genome sequencing to provide additional information of interest to medical professionals and the research community to improve understanding of the virus. Genetic sequencing for these samples is underway, but results may be inconclusive due to low viral levels in the samples, USDA said.   

Pork Producers Practice Biosecurity to Protect Pigs
Biosecurity is critical to eradicating H5N1 and other viruses. Not only does biosecurity protect the health of livestock, but it also protects the health of farmworkers and their families. For more information on protecting farmworkers, visit the CDC’s website .
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10 Powerful Take Homes to Enhance Biosecurity on Your Pig Farm
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The pork industry has worked alongside USDA’s Animal and Plant Health Inspection Service (APHIS) since 2009 to carry out the swine influenza surveillance program to identify influenza viruses circulating in swine, proactively detect reassortment viruses that could impact public health, and gain knowledge to contribute to improved animal health diagnostics and vaccines, NPPC pointed out in a statement.

“Pork producers have always been proactive and diligent about implementing biosecurity plans as part of their daily production practices to assure animals wellbeing and food safety,” Lori Stevermer, NPPC president and Minnesota pork producer said. “This detection serves as a reminder for producers of all sizes to understand and address influenza virus risks.”

What’s Next?
USDA recently approved two vaccine field safety trials for vaccine candidates designed to protect dairy cows from H5N1, and continues to explore vaccine options for other species.   As USDA takes additional steps to protect the health of livestock, it will continue to work closely with CDC to protect the health of people and FDA to protect the safety of the food supply.

“These collective, collaborative efforts have helped protect farmworkers and farmers, the health and welfare of livestock animals, and reaffirmed the safety of the nation’s food supply. The U.S. government remains committed to addressing this situation with urgency,” USDA said.

Learn more about USDA’s response to HPAI in dairy cattle.

The situation is being monitored by local public health officials, Oregon Health Authority, Oregon State Veterinarian, Oregon Department of Agriculture, as well as USDA and U.S. Department of Health and Human Services.   

Read More:
Get the Facts Straight on Highly Pathogenic Avian Influenza
Animal Health Experts Open Up About Future Disease Preparedness
How the Swine Industry Responded to H5N1 Outbreak in Dairy Cattle
A Message to the Ag Industry about H5N1

Get the Facts Straight on Highly Pathogenic Avian Influenza

Thu, 26 Sep 2024 19:12:14 GMT

Updated as of 4.10.24

Now that the mystery illness impacting dairy herds in multiple states has been revealed as the same strain of influenza virus [Influenza A (H5N1)] that has been impacting the U.S. poultry flock, pork producers are asking a lot of questions. Is this strain transmittable to pigs? Should livestock producers with cattle and pigs be concerned about cross-species transmission?

Those are all important questions, but understanding influenza is the best place to start, says National Pork Board chief veterinarian Dusty Oedekoven.

“Highly Pathogenic Avian Influenza (HPAI) is influenza. HPAI is an official term defined by the severity of the mortality rate in poultry,” he explains.

Within strains of influenza A, the naming convention goes by two proteins on the outer surface of the virus: hemagglutinin (H type) and neuraminidase (N type). Typically, HPAI is of the H5 or H7 types, but there are many other possibilities as there are 18 hemagglutinin types and 11 neuraminidase types, he explains.

“Not all of those occur in poultry, not all of those occur in pigs, and not all of those occur in humans,” Oedekoven clarifies. “But the term highly pathogenic applies to poultry.”

He believes the reason it’s making headlines as HPAI is because it’s the same strain, H5N1, or similar strain that has been found recently in poultry where they have designated it as HPAI.

“Maybe that’s a narrow thing to tease apart,” he points out. “But in my mind, I hope we can separate that a little bit. This is influenza A virus.”

Influenza A viruses affect many warm-blooded animals, including birds and mammals. That’s nothing new, Oedekoven says. Influenza A viruses have been identified in cattle in the past, as well as swine and birds.

“If we think about influenza in domesticated species and humans, we are typically looking at the cycle between humans and pigs,” he says. “Pigs become amplifying hosts of influenza A viruses and the mixing vessel for different types of viruses, as are birds. Birds can get multiple viruses and those viruses mutate within the bird, and new strains evolve. That’s how we have new strains of the virus that emerge and become different strains.”

And that’s why receiving the annual flu vaccine is so important, he adds.

“It’s likely the vaccines we got last year were designed for a different strain than what we’re looking at this year because the virus reassorted and it’s slightly different. Scientists predicting which strain we might be dealing with for the vaccine are right sometimes, and sometimes they miss the mark a little and you may see more influenza in a given year,” he says.

Fact #1: The threat of influenza virus infection in people and pigs is ever present.

Oedekoven says he has not heard of the H5N1 strain being identified in pigs at this time.

“We know pigs are susceptible to influenza A viruses, and swine influe-nza is not uncommon in the U.S. We see outbreaks of routine swine influe-nza fairly frequently,” he says. “We don’t know if there’s any special higher risk of disease or illness or mortality for pigs due to this virus strain than any other swine influenza strain we have.”

The key is diligent observation. If producers see signs of illness in their pigs, Oedekoven urges them to contact their veterinarians.

On the same hand, if they see signs of respiratory illness or flu-like symptoms in people, seek advice from healthcare providers.

Influenza A viruses are common in people, just like they are pigs. Influenza viruses are constantly changing and reassorting.

“The threat of influenza virus infection in people and pigs is ever present. It’s why healthcare providers recommend people get annual influenza vaccines to prevent against new strains of the virus that are emerging all the time,” he says.

This doesn’t represent an elevated threat, Oedekoven adds.

“It’s recognition of a threat we know is there,” he says. “Influenza viruses exist and circulate in people all the time.”

Good sanitation and hygiene are important. If employers have workers who are ill with influenza signs, don’t let them come to work because they could potentially spread that disease to the pigs, which could cause more spread to other humans.

Fact #2: There’s no evidence to support a higher risk of influenza infection from cattle to pigs than exists otherwise.

“We’re not even sure yet to what extent this strain of influenza may be transmitted from cattle,” he says.

USDA reports bovine influenza A virus (originally referred to as HPAI in many reports) in dairy cattle was first identified in samples that included unpasteurized milk from one dairy farm in Texas and two in Kansas, as well as an oropharyngeal swab from another dairy in Texas. The virus was first confirmed in one Texas herd on March 21 by Iowa State University’s diagnostic lab that was helping Texas labs process samples more quickly. Affected farms also reported finding deceased wild birds on their properties.

“Most waterfowl and wild bird species can carry influenza viruses, but usually they don’t die from it. They are good carriers of it and can become infected and produce high levels of the virus and spread it. It’s always a good biosecurity practice to keep birds away from your pigs,” he says.

Remain Vigilant
Megan Niederwerder, executive director of the Swine Health Information Center (SHIC), encourages producers to keep close tabs on biosecurity protocols to reduce risk of pathogen exposure from wildlife.

“As part of the Swine Health Information Center’s Standardized Outbreak Investigation Form, there are several hazards associated with wild birds that can be proactively considered to enhance biosecurity,” Niederwerder explains.

Examples include surface water, wild bird access to inside swine barns, equipment stored outside, compost piles, mortality disposal boxes, open feed bags, open feed bin covers and feed spillage fed to pigs, she says.

“It is important to clean and disinfect tools and equipment with potential exposure to wildlife prior to utilizing inside facilities housing pigs,” Niederwerder says.     

Prompt investigation is key, Oedekoven says. This helps veterinarians and producers handle disease challenges better. USDA notes additional testing is underway, including genome sequencing, to characterize the strain(s) associated with the detections.

Spread the Word

Pork producers play an important role in disseminating truth, Oedekoven says. According to the Centers for Disease Control and Prevention, influenza has not been shown to spread through eating properly handled pork.

“You can’t get influenza from eating or handling pork,” Oedekoven emphasized. “There’s not a risk of acquiring influenza that way. The way that it is transmitted is through aerosolization and direct contact between infected animals, including humans.”

Read More:

Piecing the Puzzle Together: Diagnostic Monitoring and Flu Prevention

Veterinarians Answer Questions on Influenza

BREAKING: Mystery Illness Impacting Texas, Kansas Dairy Cattle is Confirmed as Highly Pathogenic Avian Influenza Strain

Meat Institute: Properly Prepared Beef is Safe to Eat; HPAI is not a Food Safety Threat

Rare Human Case of Bird Flu Confirmed. Officials Believe it Began on Texas Dairy

Thu, 26 Sep 2024 19:07:46 GMT

Just a week after discovering that Highly Pathogenic Avian Influenza, also known as bird flu, was the cause of illness for several dairy herds throughout the Texas Panhandle, New Mexico and Kansas , the Texas Department of State Health Services (DSHS) is now reporting that a human case of avian influenza A(H5N1) virus has been confirmed in Texas. The case was identified in a person who had direct exposure to dairy cattle presumed to be infected with the disease.

The patient, who experienced eye inflammation as their only symptom, was tested for flu late last week with confirmatory testing performed by the Centers for Disease Control and Prevention over the weekend. Currently, the patient is being treated with the antiviral drug oseltamivir. The DSHS reports that the human case does not change the risk for the general public, which still remains low.

According to the CDC, this is the second human case of H5N1 flu in the U.S. and the first linked to an exposure to cattle. Symptoms can include a fever, cough, sore throat, runny or stuffy nose, headaches, fatigue, eye redness, shortness of breath, diarrhea, nausea, vomiting, or seizures. The illness can range from mild to severe, and health care providers who come across someone who may have the virus should “immediately consult their local health department,” according to the alert.

“The risk to the general public is believed to be low; however, people with close contact with affected animals suspected of having avian influenza A(H5N1) have a higher risk of infection,” the alert said.

While the disease is new to the dairy industry, the U.S. Department of Agriculture says there is no safety concern to the commercial milk supply. Consumer health is also not at risk, the department said. The milk from impacted animals is being dumped or destroyed and will not enter the food supply.

“Milk from impacted animals is being diverted or destroyed so that it does not enter the human food supply,” agencies said. “In addition, pasteurization has continually proven to inactivate bacteria and viruses, like influenza, in milk. FDA’s longstanding position is that unpasteurized, raw milk can harbor dangerous microorganisms that can pose serious health risks to consumers, and FDA is reminding consumers of the risks associated with raw milk consumption in light of the HPAI detections.”

The virus was detected in dairy herds in Texas and Kansas last week and has since spread to additional herds in at least five states, all of which include:

Texas
Kansas
New Mexico
Idaho
Michigan

This leads some scientists to believe that the virus may be spreading cow-to-cow.

Texas officials are guiding affected dairies about how to minimize workers’ exposure and how people who work with affected cattle can monitor for flu-like symptoms and get tested.

In addition, officials are strongly advising dairy producers to use all standard biosecurity measures. They note it’s important for producers to clean and disinfect all livestock watering devices and isolate drinking water where it might be contaminated by waterfowl. Farmers are also being asked to notify their herd veterinarian if they suspect any cattle within their herd are displaying symptoms of this condition.

“Unlike affected poultry, I foresee there will be no need to depopulate dairy herds,” says Texas Agriculture Commissioner Sid Miller. “Cattle are expected to fully recover. The Texas Department of Agriculture is committed to providing unwavering support to our dairy industry.”

For more n HPAI, read:

HPAI Now Detected on Ohio Dairy: Strange Bird Flu Concerns See Growth

Thu, 26 Sep 2024 19:03:23 GMT

Ohio has become the sixth state where dairy cattle have tested positive for highly pathogenic avian influenza (HPAI), also known as bird flu. A recent news release from the Ohio Department of Agriculture (ODA) reports presumptive positive results from dairy cows in Wood County.

According to officials, the cows arrived in Wood County on March 8 from a dairy in Texas. That dairy later reported a confirmed case of HPAI. The Ohio dairy operation alerted state officials when the livestock began showing signs of illness. State officials are awaiting confirmation from the U.S. Department of Agriculture.

“We have official confirmation that we do have a case at a dairy in Wood County of HPAI, which is an influenza,” says ODA Director Brian Baldridge. “We’ve been working with this in the poultry industry for about the last two-and-a-half years and it has found its way into the dairy industry. We are working diligently with the dairy, with their vets and with our Animal Health division and our state veterinarian, Dr. (Dennis) Summers, on this issue.

According to the USDA, HPAI has now been detected in five other states, including:

Texas
Kansas
New Mexico,
Idaho
Michigan

“Clinically sick dairy cattle from affected herds range from 1% to 20%, with an average of 10% of the milking herd affected. There are no confirmed reports of death loss in dairy cattle directly attributed to these detections. Most sick cows begin recovering within a few days.”

“Federal and state agencies continue to conduct additional testing from sick animals and in unpasteurized clinical milk samples from sick animals, as well as viral genome sequencing, to assess whether HPAI or another unrelated illness may be underlying any symptoms,” the ODA reports.

The agency notes that clinically sick dairy cattle from affected herds range from 1% to 20%, with an average of 10% of the milking herd affected. Currently, there are no confirmed reports of death loss in dairy cattle directly attributed to these detections with most sick cows recovering within a few days.

HPAI symptoms in dairy cattle include:

Sudden drop in milk production.
Some severely impacted cows are producing thicker, more concentrated, colostrum-like milk.
Drop in feed consumption with a simultaneous drop in rumen function, accompanied by loose feces and some fever.
Impacted herds have reported older cows in mid-lactation may be more likely to be severely impacted than younger cows, fresh cows or heifers.
Some herds have reported pneumonia and mastitis.

Officials are strongly advising dairy producers to use all standard biosecurity measures. They note it’s important for producers to clean and disinfect all livestock watering devices and isolate drinking water where it might be contaminated by waterfowl. Farmers are also being asked to notify their herd veterinarian if they suspect any cattle within their herd are displaying symptoms of this condition.

For more on HPAI, read:

3 Global Disease Pressures Impacting Livestock Producers

Thu, 13 Jun 2024 00:12:08 GMT

Tariffs and disease—the two words that strike fear into every livestock farmer and stakeholder. Even as trade talks continue, the U.S. is on high alert to make sure several foreign animal disease (FAD) threats stay outside U.S. borders.

African swine fever spreads in Europe and China

On Sept. 9, a case of African swine fever (ASF) was found by Belgian authorities, after three adult wild boars were found dead near the southern village of Étalle, in the Belgian province of Luxembourg. In total, eight infected wild pigs have been found. No cases of disease had been found on commercial pig farms, officials said.

As of press time, China has reported nearly 20 cases of African swine fever (ASF) since July, affecting eight provinces. China has banned transportation of live hog and pig products in 16 regions to help contain the disease spread. The affected areas include the provinces of Hebei, Shanxi, Jilin, Fujian, Jiangxi, Shandong, Hubei and Shaanxi as well as the Inner Mongolia Autonomous Region and the city of Shanghai.

China’s Ministry of Agriculture and Rural Affairs says the country’s sow herd, as of August 2018, is 4.8% smaller than a year ago. The sow herd declined just over 1% from the month prior.

The largest portion of the Chinese pig herd rests in the central part of the country. The ban has interrupted supply channels at every level, report many farmers. The Liaoning providence in the northeast exports nearly 20% of its pigs each year to the southern part of the country, under normal conditions. While hog supplies are accumulating in the north with no market access, hog prices in the southern providences have soared.

Pork prices in the Zhejiang province have increased 23% since the outbreak, due to the transportation ban. Complicating pork price disruptions even further is China’s trade war with the U.S. Pork makes up about two-thirds of China’s meat consumption.

Other cases of the disease have been found in Romania this year.

ASF is a highly contagious hemorrhagic disease that produces a wide range of clinical signs and lesions. There is no vaccine or treatment for the disease, but does not affect human health.

Classical Swine Fever resurfaces in Japan after 26 years

Also known as hog cholera, Classical Swine fever , was identified Sept. 9th on a farm located at Gifu Prefecture, in the central area of Japan, killing 80 pigs. The last CSF outbreak in Japan was in 1992. In 2007, the use of vaccination was banned and disease eradication was declared.

While the Gifu Prefecture is not a major area of swine production, it’s only 500 miles from the south region, the highest pig-dense area.

Unrelated to ASF cases in China, CSF does present similar clinical symptoms with mortality rates of nearly 100%. Swine Health Information Center (SHIC) says the remaining 610 pigs on the farm were culled to contain the outbreak and no clear origin of the infection has been found. Additional testing continues. Commercial vaccines are available for the control of CSF.

Exports have been suspended until Japan’s veterinary services can determine if control measures are sufficient.

Japan is also still recovering from the 2013-2016 porcine epidemic diarrhea (PED) epidemenic , reports SHIC. On July 9, 2018, USDA-APHIS had published the official notice of the OIE recognition of Japan as free-CSF. Currently, Japan is one of the Top 10 pork-producing countries in the world.

Foot and mouth disease continues to torment China, South Korean farmers

ASF isn’t the only disease China’s Ministry of Agriculture is struggling to contain. An outbreak of foot and mouth disease in a herd of cattle was found Sept. 6, and later confirmed diagnosis of the O-type strain of the disease Sept. 14.

The cattle had been transported to the Xinjiang region from Gansu province. Local authorities in Xinjiang culled 47 cattle following the outbreak. The outbreak is now under control, the Chinese ministry said.

However, this is the eighth case of the O-type strain found in livestock in China this year. In August, China culled 173 pigs due to FMD.

South Korea has also seen reports of the disease this year. In both countries, there is extensive vaccination for the disease, but the efficacy of the vaccine and the compliance to the vaccination regime can vary widely.

Leaders advise U.S. farmers to review farm biosecurity plans

All of these threats underline the need for U.S. producers and feed suppliers to review and increase biosecurity protocols to keep disease threats from affecting the U.S. herd.

Dave Pyburn, DVM, vice president of science and technology for the Pork Checkoff, advises producers to review the Foreign Animal Disease Checklist at pork.org/FAD . “By going through the items on this list, you can improve your biosecurity plan and prepare to register for the voluntary Secure Pork Supply plan, which will help participants maintain business continuity in the event of a FAD,” he says.

According to Iowa State University economist Dermot Hayes, losses from ASF could total as much as $8 billion for the pork industry in year one alone. That doesn’t include related losses of $4 billion and $1.5 billion for the affected input commodities of corn and soybeans, respectively.

“Keeping trade-limiting foreign animal diseases, such as ASF, out of the U.S. is critical to pork producers,” said Steve Rommereim, National Pork Board president and a producer from Alcester, South Dakota. “We all need to improve the overall level of FAD preparedness. We hope for the best, but we must prepare for the worst.”

Producers hope a FAD vaccine bank, included the current draft of the next farm bill, will help provide additional resources. Funding of the vaccine bank, however is unclear .

For example, NPPC anticipates the U.S. will need an inventory of 10 million doses of FMD vaccine, the estimated need for the first two weeks of a potential outbreak. The vaccine bank would also need to store FMD antigen against all 23 of the most common types of the disease. Read more by clicking the image below:

Minnesota Goat Confirmed to Have Highly Pathogenic Avian Influenza

Fri, 22 Mar 2024 17:21:58 GMT

A juvenile goat in Minnesota recently tested positive for highly pathogenic avian influenza (HPAI). While HPAI has been detected in predatory mammals that prey on infected birds, this is the first identified case of HPAI in domestic livestock in the U.S. The goat lived on the same premises where a poultry flock tested positive for HPAI in late February. The goat shared the same pasture and sole water source as the poultry flock.

HPAI is a known disease of wild and domestic poultry and waterfowl. There is limited information available about HPAI infection in ruminants, though in some species, animals with immature or compromised immune systems appear to be at greater risk of infection. Only young goats were afflicted in the Minnesota case, not mature goats. This case is being investigated by the Minnesota Board of Animal Health with the assistance of the U.S. Department of Agriculture.

“As we aim to protect livestock for our North Dakota producers, the risk of transmission increases during spring,” says Miranda Meehan, North Dakota State University Extension livestock environmental stewardship specialist.

“While we don’t envision this zoonotic transmission to be commonplace, good biosecurity protocols separating livestock from poultry/waterfowl is a good production practice to reduce the potential spread of HPAI to our small ruminants during the spring migration of wild birds,” says Travis Hoffman, NDSU Extension sheep specialist.

“H5N1 HPAI has been detected in wild birds throughout all U.S. migratory flyways , says Dr. Gerald Stokka, NDSU Extension veterinarian and livestock stewardship specialist. “Wild birds can be infected without showing symptoms of the infection. While waterfowl are the primary carriers, positive cases are being documented in predatory birds and mammals, and now domestic goats.”

NDSU Extension experts support the biosecurity practices released by University of Minnesota Extension that can reduce the potential for domestic animals to contract HPAI. Recommended practices include:

Do not allow poultry and livestock species access to ponds, wetlands and other stagnant water sources that are frequented by wild waterfowl such as ducks, geese or swans.
Watch poultry and livestock for signs of illness, including reduced appetite, fever, inability to stand, depression, nasal discharge, diarrhea, coughing and change in behavior.
Consider housing poultry separately from other livestock species and minimize poultry access to pasture areas that are grazed by other livestock species.
Do not allow poultry, waterfowl and wildlife to share water sources and feedstuffs with other livestock species.

Protocols for protecting livestock include:

In the Minnesota goat case, infected goats shared the same water source as infected poultry. Limiting livestock exposure to potentially inflicted-HPAI poultry is the first action of defense.
Current influenza vaccines used in horses are not effective against HPAI. Always consult your veterinarian before administering vaccinations.
Many cattle are vaccinated against Parainfluenza-3 (PI-3), a virus that can cause respiratory issues. Parainfluenza viruses are in a different family from influenza viruses and the PI-3 vaccine does not provide protection against influenza.
If you have an unexplained death in one of your animals, consult with your farm veterinarian, contact the North Dakota Board of Animal Health .

“There is no evidence that anyone has contracted the virus from eating a fully cooked bird, either domestic or wild,” says Julie Garden-Robinson, NDSU Extension food and nutrition specialist and professor of health, nutrition and exercise sciences. “It is always a safe practice to fully cook wild game to 165 degrees Fahrenheit, regardless of whether there is a threat of HPAI.”

NDSU Extension HPAI resources are available at ndsu.ag/hpai . UMN Extension HPAI resources are available at z.umn.edu/HPAIgoat .

Avian influenza surveillance and testing in wild birds is being done by the USDA’s Animal and Plant Health Inspection Service (APHIS) and the North Dakota Department of Game and Fish. To learn more about HPAI cases in birds and mammals, please visit the USDA’s APHIS website . Report sick and dead wildlife at https://gf.nd.gov/wildlife/diseases/mortality-report . Direct wild bird avian influenza questions to 701-204-2161.

Researchers Confirm There Are Only Six Unique Strains of African Swine Fever Virus

Mon, 20 Nov 2023 15:43:52 GMT

Although experts previously identified 25 different African swine fever (ASF) virus genotypes, USDA Agricultural Research Service (ARS) researchers announced they have reclassified the number of virus strains from 25 to only six unique genotypes.

This scientific innovation may help redefine how ASF researchers across the globe classify ASF virus (ASFV) isolates and may make it easier for scientists to develop vaccines that match the different strains circulating in ASF endemic areas across the globe, ARS said in a release on Nov. 13.

“Our research team recently re-evaluated all the publicly available virus DNA sequence and found that the majority of genotypes (genetic makeup) originally identified as novel were not correctly identified nor compared to already existing ASFV virus genotypes,” said senior ARS scientist Douglas Gladue. “Based on this analysis, there are actually fewer unique genotypes than the ASF research community believed, and that means that there is less diversity of ASFV affecting communities across the globe. This information is important as it may reduce the number of vaccines previously thought to be needed to protect against all ASFV genotypes.”

Accurate classification of viruses is key for epidemiological investigations, ARS pointed out, and the development of cost-effective countermeasures, including developing vaccines for unique strains of ASFV.

Researchers re-analyzed more than 12,000 historical and current virus isolates that were produced from ASFV labs worldwide. The effort was made possible using the computing power of SciNet, ARS’ super computer cluster for solving agricultural big data problems.

The highly contagious ASFV spread from Africa to the Republic of Georgia in 2007, and has since swept through Europe, the Dominican Republic and Asia, before reaching South Africa in early 2023. Although ASFV is causing profound economic losses to the global swine industry, there have not been any outbreaks in the U.S. to date. The virus is unable to transmit from pigs to humans so it poses no food safety or human health risks.

Editor’s Note: This research is highlighted in this month’s issue of Viruses and includes research and development input from the National Bio and Agro-Defense Facility, the Canadian Food and Inspection Agency, and Makerere University in Uganda.

Seeking Answers to Porcine Reproductive and Respiratory Syndrome Virus, Nebraska Researchers Take Action

Fri, 25 Aug 2023 15:30:34 GMT

Porcine Reproductive and Respiratory Syndrome Virus (PRRSV) is a prevalent pathogen causing reproductive issues in sows and severe respiratory illnesses in pigs across all age groups. This virus also has the capacity to manipulate the pig’s immune system, heightening its vulnerability to other contagious diseases.

The economic toll on the U.S. swine industry due to PRRSV is substantial, with estimated annual costs reaching $1.1 billion, notes a recent University of Nebraska-Lincoln release .

Leading the way in research efforts is Hiep Vu, an associate professor specializing in animal science at the University of Nebraska-Lincoln. This research initiative, supported by a three-year grant from the USDA, is a collaborative endeavor. Sarah Sillman, an assistant professor affiliated with the Nebraska’s School of Veterinary Medicine and Biomedical Sciences and the Nebraska Veterinary Diagnostic Center, serves as the co-director alongside Vu.

The researchers plan to investigate the mechanisms by which PRRSV infiltrates swine macrophages – the immune cells responsible for identifying, engulfing and neutralizing harmful invaders, including viruses and bacteria. Viruses can only replicate within living cells they infiltrate, notes the release.

“As long as we can prevent viruses from entering a cell, we can prevent viral infection,” Vu emphasizes.

Understanding the specific cell types that the virus targets and the modes of infiltration enhances scientists’ capabilities to formulate effective vaccines and strategies to counteract the virus’s impact.

A recent breakthrough by Vu involves the identification of a PRRSV variant that has lost much of its ability to infect swine macrophages while still retaining effectiveness in infecting MARC-145 cells. This particular variant carries a tiny genomic alteration compared to the strain that targets macrophages, notes the release. Vu’s upcoming investigation aims to uncover the reasons behind this discrepancy in infectivity.

Finding answers, Vu says, can be critical for the development of a safe and efficacious PRRSV vaccine.

“Additionally, this knowledge will provide novel insights for generating PRRSV-resistant pigs, either through natural selection or genome editing,” Vu explains.

This project underscores the collaboration between diverse fields related to animal health. Vu, a molecular virology expert, and Sillman, an authority in veterinary pathology, bring unique expertise to explore PRRSV characteristics and its impact on pig health.

The research initiative received $627,000 in support from the USDA’s National Institute of Food and Agriculture through its intramural research program.

Australia Raises Its FMD Alert

Thu, 21 Jul 2022 18:39:12 GMT

Australia has come under the threat of foot and mouth disease after traces of the disease were detected from goods coming into the country this week.

Agriculture Minister Murray Watt said viral fragments of foot and mouth disease were detected in meat products that entered Australia recently from Indonesia and China. Those viral fragments are not live and cannot be transmitted, he said.

“We have detected foot and mouth disease and African swine fever viral fragments in a small number of pork products for sale in the Melbourne CBD that were imported from China,” Watt said.

“In addition to this a passenger travelling from Indonesia has in recent days been intercepted with a beef product that they didn’t declare which tested positive for foot and mouth disease viral fragments,” he said.

As part of the Australian Government’s response to the spread of animal diseases in the region, the Department of Agriculture, Fisheries and Forestry has increased its surveillance and testing of meat and other animal products, both at the border and through targeted checking of retail outlets.

Some pork products have been removed from supermarket shelves after viral fragments of both foot and mouth disease (FMD) and African swine fever (ASF) were detected during testing.

Due to the outbreak of the disease in Indonesia, travelers arriving in Australia from Indonesia will now be required to walk across sanitation foot mats at airports. The mats will contain a citric acid solution designed to dislodge any dirt from the sole of the shoe and cover it in the acid.

Australian government officials said a positive case of foot and mouth on an Australian farm could shutter the $27 billion livestock export trade. The government estimates the total cost of a major outbreak at $80 billion.

Despite the recent findings, Australia remains foot and mouth disease-free, according to Watt.

UK Officials Rule Out Suspected Case of Foot-and-Mouth Disease

Fri, 24 Jun 2022 22:12:21 GMT

British officials on Friday ruled out a suspected case of foot and mouth disease in the rural eastern English county of Norfolk.

Movement restrictions and a temporary 10-km control zone for animals were enforced around a farm, according to the Department for Environment, Food and Rural Affairs.

“Following swift action in response to this possible case I can confirm that testing has enabled me to fully rule out presence of (foot and mouth) disease,” Christine Middlemiss, Britain’s chief veterinary officer, said on Twitter.

Foot and mouth disease is a severe, highly contagious viral disease of livestock that affects cattle, swine, sheep, goats and other cloven-hoofed animals.

According to the World Organization for Animal Health, FMD is not readily transmissible to humans and is not a public health risk.

The last British outbreak was in 2007, but a particularly severe outbreak occurred in 2001, which culminated in the slaughter of more than 6 million animals.

Read More:

Risk and Mitigation of Foot-and-Mouth Disease Virus in Feed