Fig. 2From: The molecular characteristic analysis of PRRSV GSWW/2015 strain and its pathogenicity to pigsPhylogenetic tree drew by comparing the whole genome of GSWW/2015 with 34 reference PRRSV strains by MEGA5.2. Three subgroups are indicated by different colors: subgroup 1 (red) includes 6 strains, subgroup 2 (green) includes 8 strains, subgroup 3 (black) includes 21 strains. The newly isolated strain GSWW belongs to subgroup 3 as indicated by a black dotBack to article page