Figure 1

Design of the consensus sequence of ORF2-6 genes (ORF2-6-CON). The ORF2-6-CON was designed according to 30 representative Chinese PRRSV isolates. A phylogenetic tree based on ORF2-6 genes was constructed (A). The ORF2-6-CON shared > 90% nucleotide identities to all four lineages of PRRSV2 isolates existing in China (B).