Fig. 1From: Genetic diversity of porcine reproductive and respiratory syndrome virus and evaluation of three one-step real-time RT-PCR assays in KoreaPhylogenetic analysis of ORF5 of PRRSV-1 isolates. The tree was constructed by maximum likelihood method. Prototype viruses, vaccine viruses used in Korean swine farms were marked with and , respectively. Subgroup A and C of field strains obtained from this study was marked with and , respectivelyBack to article page