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. 2021 Nov;27(11):2940–2943. doi: 10.3201/eid2711.204893

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Phylogenetic tree of highly pathogenic avian influenza A(H5N8) viruses isolated in Shanghai, China during 2020 (red text) and reference sequences from GISAID (https://www.gisaid.org). Tree was based on hemagglutinin gene segment; it was constructed using IQ-TREE (13) with 1,000 bootstrap replicates. Yellow shading indicates subclade 2.3.4.4b strains. Pink and blue shading indicate 2 sublineages of subclade 2.3.4.4b. Numbers to the left of node indicate bootstrap values. Scale bars indicate average number of nucleotide substitutions per site.