A retrospective study of risk factors for porcine reproductive and respiratory syndrome virus infection and clinical disease in swine herds in Illinois during the early years of the pandemic
نویسندگان
چکیده
Results: Larger herd size was associated with an increased risk, and isolation of purchased gilts with a decreased risk, of both PRRS virus infection and clinical PRRS. Purchase of semen for AI was associated with an increased risk of PRRS virus infection. Implications: Swine producers should certify that purchased semen is free of PRRS virus, gilts should be isolated prior to introduction to the herd, and biosecurity measures should be implemented to prevent PRRS virus infection, particularly in larger herds.
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