Fig. 1.
Geographic distribution of Korean field viruses infected in 631 swine farms with respect to single (Type 1 or Type 2 PRRSV) and co-infection (Type 1 & 2 PRRSV)
Geographic distribution of Korean field viruses infected in 631 swine farms with respect to single (Type 1 or Type 2 PRRSV) and co-infection (Type 1 & 2 PRRSV)