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Maximum clade credibility trees of hemagglutinin gene of influenza A(H5N6) viruses, China. Red indicates human-origin H5N6 viruses; blue triangles indicate H5Ny vaccine strains recommended by the World Health Organization; blue dot indicates the most recent common ancestry of clade 2.3.4.4b A(H5N6) human viruses in 2021. Posterior probabilities >0.9 are labeled on the branches.
