Use of Ingelvac~R PRRS MLV in a protocol to control and eliminate NA strain of PRRS virus in two large breed to wean sites as part of an area regional control project

摘要

In an effort to reduce the spread of the porcine reproductive and respiratory syndrome (PRRS) virus, area regional control (ARC) projects have changed their focus to a preventative approach aimed at a reduction in disease transmission between farms, along with individual farm management and diagnostics. Within these projects, herd closure, homogenization of population immunity with attenuated virus vaccination, and continued stability status monitoring have been found to be effective means to controlthe virus with the ultimate goal of virus elimination. Described are two 2400-head, breed-to-wean farms (A and B) that are part of an ARC project in Northern Illinois that underwent PRRS virus control. Farms A and B became infected with a North AmericanPRRS virus strain (1-18-4) in mid-2006. At this time, they experienced clinical signs including increases in sows off feed, abortions, pre-weaning mortality and morbidity, stillborns, and mummies. Downstream, wean-to-market farms experienced increased f