FIG. 1.

Phylogenetic tree constructed from concatenated sequences (2,855 bp) of seven housekeeping genes of Leptospira strains. The identification numbers of the strains, the serogroups, and the serovars (in parentheses) are indicated. Gri., Grippotyphosa; Ict., Icterohaemorrhagiae. The neighbor-joining method (18) was used for sequence comparison. Phylogenetic analysis was conducted with MEGA4 (21). The evolutionary distances were computed using the maximum composite likelihood method (22). Only bootstrap values greater than 70 are shown.