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Phylogenetic tree based on the HA gene (nucleotides 77 to 1200, 1,124 bp) of H5N1 influenza A viruses. The nucleotide sequences were analyzed by Phylip3.65 software using the neighbor-joining method with 100 bootstraps. The tree was rooted to the A/Gs/Guandong/1/96 HA sequence. Viruses in colored bold type were included in this study. Abbreviations: Ck, chicken; Dk, duck; Gs, goose; Qa, quail; JWE, Japanese white eye; WS, whooper swan; BHG, bar-headed goose.
