How much is the spread of 1-7-4-related PRRS viruses due to animal movement?

This is our Friday rubric: every week a new Science Page from the Bob Morrison’s Swine Health Monitoring Project. The previous editions of the science page are available on our website.

Today, Dr. Makau and collaborators from the University of Minnesota provide insights into the role that repeated animal movements between farms play in the risk for Lineage 1A PRRS virus disease occurrence.

Keypoints: 

  • Animal movements from 496 farms from a dense pig production area in the US, between 2014-2017, were analyzed.
  • Direct contact (through animal movements) and indirect contact with an L1A (Lineage 1A)-positive farm increased the likelihood of L1A occurrence, and occurrence of  non-L1A PRRS virus one year prior decreased the likelihood of an L1A occurrence.
  • Outbreak risk increased for farms that engaged in more outgoing shipments.
Continue reading “How much is the spread of 1-7-4-related PRRS viruses due to animal movement?”