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Global phylogenetic history and geographic distribution of H5N6 AIVs. Viruses sampled from different locations (n = 487 in total), including Wugang (i.e., Hunan), are distinguished by their colors, and all reassortant viruses detected in this study are also indicated. All branch lengths are scaled according to the number of substitutions per site (subs/site). The tree is rooted using A/duck/Vietnam/LBM360c1-4-1/2013 (H5N6), which was collected on 6 February 2013.
