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Host distribution of each lineage and clade for A/H9 influenza viruses as part of a proposed global classification and nomenclature system for A/H9 influenza viruses. The bar chart illustrates the percentage of host composition for each lineage and clade. Hosts are grouped into the following categories, represented as colors on each bar: avian wild, avian domestic, avian (birds that are not identified as wild or domestic), environment, human, and mammalian (other than human).
