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Phylogenetic tree and alignment based on the full-length nucleotide sequences of 204 NA-type PRRSV strains. (Left) Red, blue, black, green, and brown represent HP-PRRSV, intermediate PRRSV, CH-1a-like PRRSV, VR-2332-like PRRSV, and NADC-30-like PRRSV strains, respectively. (Right) Alignment of partial amino acid sequences of NSP9 of 204 NA-type PRRSVs. The two conserved amino acids are highlighted in yellow.
