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Maximum-likelihood phylogenetic tree of the H3 hemagglutinin (HA) genes, including viruses with the TX98-like H3 in the C-I clade reported in our investigation. Arrows demonstrate co-detection with contemporary influenza A virus (IAV) within their respective phylogenetic clade. TX98-like H3 form a separate statistically supported monophyletic C-I clade compared to contemporary IAV.
