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Phylogenetic relationships based on the NA (nucleotides–1388) genes of Fa/SA/05 and Fa/KW/07 viruses. The nucleotide sequences were analyzed by PHYLIP3.65 software using the neighbor-joining method with 100 bootstraps. The NA phylogenetic tree was rooted to the NA gene of A/Chicken/Hong Kong/220/97. Viruses in bold red type were characterized in this study. Clades are indicated.
