Fig. 1

Phylogenetic analysis of whole genomes of HNjz15 and HNyc15 with other 54 PRRSVs (10 vaccine strains and 44 field isolates, virus information are available in the Additional file 1: Appendix) (a) and unique discontinuous deletions in nsp2 of NADC30-like PRRSVs (b). Each isolates was expressed by isolation years followed by isolation country and name of virus strain. Phylogenetic analysis was performed by using a distance-based neighbor-joining method with 1000 bootstrap replicates in MEGA6. Numbers along branches are bootstrap values. Scale bar indicates nucleotide substitute per site