Risk assessment of PRRS vaccine virus transmission from a vaccinated nursery to a PRRSv negative sow farm through weaned pig trailers

摘要

Many sow farms work to and produce PRRSv PCR negative piglets. These piglets are often sent to nurseries in hog dense areas, where the prevalence of PRRSv is high. Piglets are often vaccinated against PRRSv upon arrival to the nursery to allow them time to develop an immune response prior to exposure with a PRRSv field strain. There is concern over the risk of transmission of PRRSv from the weaned pig trailer traveling from a vaccinated nursery site back to a negative sow farm. Therefore, the objective of the investigation was to assess the risk of transmission of Ingelvac~R PRRS MLV from a vaccinated nursery to a PRRSv negative sow farm through the weaned pig transport trailer.