Fig. (2) Phylogenetic analysis of whole genomes of six NADC30-like PRRSVs with other 54 PRRSVs (10 vaccine strains and 44 field isolates). Phylogenetic analysis was performed by using a distance-based neighbor-joining method with 1,000 bootstrap replicates in MEGA6. Numbers along branches are bootstrap values. Scale bar indicates nucleotide substitute per site.