FIG 1.

Distribution of the molecular types of 58 Treponema pallidum subsp. pallidum strains in heterosexual men, heterosexual women, and men who have sex with men (MSM). The 58 completely typed Treponema pallidum subsp. pallidum strains in this study were categorized by their self-reported transmission route (heterosexual men, heterosexual women, and MSM). The numbers of strains of each molecular type are shown by the bar size for that type. Molecular types specific to one transmission route are shown in white. Type 14p/f strains, specific to heterosexuals (men and women), are shown in gray. Type 14d/f strains, common in all three groups, are shown in black.