FIG. 1.

Phylogenetic tree of RSV-B strains constructed by the neighbor-joining method. Partial nucleotide sequences of the second variable region of the G gene (270 to 330 bases) of strains from the 2001-2002 season to the 2009-2010 season were aligned. Reference sequences of group B genotypes from other studies were included in the analysis of the respective groups for comparison. Previously reported Niigata RSV-B BA sequences are marked with asterisks. The scale bar represents the number of nucleotide substitutions per site, and the values at the nodes are bootstrap values for 1,000 iterations. Only values of greater than 50% are shown. Genotypes are indicated at the right by brackets.