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. 2021 Mar 13;9(3):257. doi: 10.3390/vaccines9030257

Figure 1.

Figure 1

Phylogenetic relationship of the influenza A and influenza B hemagglutinin proteins. Group 1 IAVs (blue) and group 2 IAVs (green) phylogenic groups are indicated. Subtypes which are known to circulate in humans (or have previously like H2) are circled in red, while subtypes which infect avian species but are recognized to have significant pandemic potential for zoonotic transmission are circled in yellow. Representative strains for each HA subtype were aligned using ClustalW alignment and a maximum-likelihood phylogenetic tree was constructed using PhyML3.3 on Geneious 11.1.5.