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Designation of sub-genotypes SA1 to SA15 for clade 2.3.4.4B H5N1 HPAI viruses in southern Africa in 2021–2022. The maximum likelihood phylogenetic tree for the HA gene (SA1 to SA14 only) is rooted in the Senegalese virus; only bootstrap values ≥50% are shown. The sub-clades A1–4, B1–4, C1–3, D1–4, E1–4, G1 & 2 and H1 & 2 were inferred from the maximum phylogenetic trees in Figure S3a–h. Italics represent sub-genotypes tentatively assigned from partial genome sequences.
