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Phylogenetic trees of PB2 (A), PB1 (B) and PA (C) genes of H4N6 AIVs in China. Phylogenetic trees were generated by the neighbor-joining method and bootstrapped with 1000 replicates using MEGA6. Analysis was based on nucleotides 1–2277 of the PB2 gene, 1–2274 of the PB1 gene, and 1–2151 of the PA gene. Virus subtypes that are not H4N6 are indicated in brackets. Virus strains isolated in this study are highlighted in red.
