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. 2020 Aug;26(8):1906–1911. doi: 10.3201/eid2608.200244

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Time-scaled evolution of influenza A(H7N9) viruses, China. A) Analysis of root-to-tip divergence against sampling date for the hemagglutinin gene segment (n = 189). B) Maximum clade credibility tree of the hemagglutinin sequence of H7N9 viruses sampled in China (n = 189); the H7N9 viruses collected in this study are highlighted in red. Asterisk indicates viruses from a human with H7N9 infection within sublineage B during March 2019. Shaded bars represent the 95% highest probability distribution for the age of each node. Parallel amino acid changes along the trunk are indicated.