Reduction of wild-type PRRS virus shedding in aerosol of growing pigs by modified-live virus vaccination at weaning

摘要

The risk of area-spread of porcine reproductive and respiratory syndrome virus (PRRSV) continues to be high in swine-dense regions potentially because of PRRSV shedding from large populations of growing pigs. The therapeutic use of modified-live virus(MLV) vaccine in infected pigs has been shown to reduce the duration of wild-type virus (WTV) shedding to sentinels and in aerosol. The objective of this study was to quantify the effect of MLV vaccine on performance and measure WTV shedding in pigs vaccinated at weaning and challenged 4 weeks later.