Abstract:Porcine reproductive and respiratory syndrome (PRRS) is one of the viral diseases affecting the global pig industry,and it is also called "blue ear disease" in China.PRRS is infected by porcine reproductive and respiratory syndrome virus (PRRSV),which is widespread in China and has caused serious economic losses to pig industry.PRRSV can cause immunosuppression in pigs,thereby increasing the probability of bacterial secondary infection,and thus affecting the immune effect of other vaccines.In addition,PRRSV inhibits the host immune response,which is conducive to the persistence of PRRSV infection.Current commercial vaccines cannot meet the requirements of both efficacy and safety,and the application of live attenuated vaccines further increases the probability of PRRSV mutation and recombination,making PRRS one of the most challenging viral infectious diseases in the world.This paper summarized and analyzed the difficulties of PRRS prevention and control,and put forward prevention and control suggestions for pigs under different conditions,in order to provide thoughts for PRRS prevention and control and purification.
