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. 2006 Aug;44(8):2705–2713. doi: 10.1128/JCM.02694-05

FIG. 2.

FIG. 2.

Phylogenetic analysis of HA genes of influenza B virus isolates obtained during the 1999-2005 influenza season. The dendrogram of the 44 influenza B virus outbreak strains, with 28 reference strains from GenBank, is based on 738 nucleotides (nucleotides 98 to 836) of the HA1 gene using the neighbor-joining method with the DNADIST distance measure program (PHYLIP, version 3.573c). The percentage of bootstrap frequency of each branch in the tree is indicated. B/Lee/40 was included as an outgroup.