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H5N1 HPAI viruses from Canada belong to two distinct phylogenetic groups. H5N1 HA sequences from North and South America, Europe, Asia and Africa collected since October 2021 were used to generate a maximum-likelihood phylogenetic tree. Sequences from North America and Europe generated in this study are highlighted by brown colors, and the B1 and B2 HA sub-lineages [5] are also labelled. Sequences from other geographical locations have black node tips.
