Success of individual herd eradication, coupled with the recent startup of a number of regional eradication programs, and the development of tools to assess the risk of reintroduction (PRRS Risk Assessment tool) and prevent reinfection (air filtration, biosecurity, PRRS-negative breeding stock) has renewed interest in pursuing strategies to eradicate the virus from the nation’s swine herds.
http://nationalhogfarmer.com/health-diseases/news/0928-prrs-eradication-course/