Fig. 1.

Neighbor-joining trees showing phylogenetic relationships of 23 V. cholerae strains representing diverse serogroups. (A) All V. cholerae strains based on 1,676 genes (1,370,469 bp). (B) Phylocore genome (PG) clade based on 2,663 genes (2,567,393 bp). (C) Seventh pandemic (7P) clade based on 3,364 genes (3,291,577 bp). Bootstrap supports, as percentage, are indicated at the branching points. Bars represent the numbers of substitution per site, respectively. Only orthologous genes showing >95% nucleotide sequence similarity to those of V. cholerae N16961 were selected. The tree was rooted using Vibrio vulnificus YJ016 and Vibrio parahaemolyticus RIMD 2210633.