Figure 3.
Phylogenetic tree of HA sequences of B viruses which was inferred by using the maximum likelihood. The percentage of replicate trees in which the associated taxa clustered together in the bootstrap test (1000 replicates) is shown next to the branches. Influenza B sequences originally identified in this study are reported with black circles (URT sample of severe case), red/black circles (LRT samples of severe cases) and white circles (URT samples of mild cases). The vaccine strain is reported in bold and reference strains are reported in grey. Amino acid mutations are reported in red.