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. 2016 Mar;22(3):507–510. doi: 10.3201/eid2203.151006

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Temporally structured maximum clade credibility phylogenetic tree (years shown on the horizontal axis) of the hemagglutinin gene of highly pathogenic avian influenza (H5 clade 2.3.4.4) viruses. Yellow, group A; green, group B. Branches of group A are colored according to the origin of the sample: purple, isolates from poultry farms (South Korea); blue-green, icA2 (North America, Japan); green, icA1 (Europe, South Korea, Japan); red, icA3 (South Korea, Japan).