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Global phylogenetic star tree (BEAUTi and BEAST v1.10.4) of H9 influenza A viruses (IAVs) based on the HA1 nucleotide sequence. H9 major lineages are color coded, respectively: h9.1—North American, teal; h9.1.2—South American, purple; h9.2—Y439, blue; h9.2.2—Korean, pink; h9.3—BJ94, green; h9.4.1—G1-Eastern, red; h9.4.2—G1-Western, orange.
