Although the cases of the new porcine reproductive and respiratory syndrome (PRRS) Lineage 1C RFLP 1-4-4 variant dropped as shown in a recent Morrison Swine Health Monitoring Project (MSHMP) report, Cesar A. Corzo, DVM, associate professor and Leman Chair in Swine Health and Productivity at the University of Minnesota, cautions producers to stay alert. The MSHMP report reflects data obtained by the labs of MSHMP participant systems, which represents 50% of the U.S. breeding herd and some growing pig farms.
“The virus is still making its way throughout the Midwestern U.S. and cases continue but with a decreasing trend in the current second wave of the epidemic,” Corzo says.
Since MSHMP’s last update on June 15, a total of 259 sequences from 14 MSHMP production systems were detected in 227 sites (84 growing pig farms, 57 breeding herds, and 86 with no information on site type). Cases are clustered in time and space which is already telling us that the virus is being effective at transmitting from one herd to another.
“This strain continues to be detected in Minnesota, Iowa, Illinois, South Dakota and Wisconsin,” Corzo says. “The number of cases detected in this second wave has already surpassed the number of cases in the first peak.”
New datasets come in monthly, so MSHMP reminds producers that a few weeks lag in identifying cases is expected.
Each week the MSHMP team continues to monitor the detection of this new PRRS variant and provide an update of the epidemiological curve of cases associated with this variant. MSHMP is a Swine Health Information Center funded project.
Read More:
Is This Year’s PRRS Better or Worse?
Biosecurity in the U.S. Pork Industry: Are the Gaps Opening?
