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. 2024 Aug;30(8):1631–1641. doi: 10.3201/eid3008.240209

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Human respiratory syncytial virus B lineages classification. A) HRSV-B maximum-likelihood phylogenetic tree (1,385 sequences), colored according to lineage classification. Black star indicates B.D lineage, defined by the 60-nt duplication in the G gene. Scale bar indicates substitutions per site. B) Simplified scheme of the lineage designation to highlight the presence of nested lineages. The amino acid changes in the F glycoprotein are listed next to lineage name and colored according to their location in the fusion protein.