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Molecular typing and macrolide resistance analyses of Treponema pallidum in heterosexuals and men who have sex with men in Japan in 2017.
Journal of Clinical Microbiology 2018 October 25
In recent years, syphilis notifications have increased dramatically in Japan. We carried out molecular typing and macrolide resistance analyses of Treponema pallidum subsp . pallidum samples collected from patients at four clinics and a hospital in Tokyo and Osaka prefectures in 2017.The macrolide resistant strain type 14d/f (SS14-like clade) was found in significantly more cases of syphilis among heterosexuals than in those among men who have sex with men (MSM); i.e., 79% (31/39) of the strains from heterosexuals were 14d/f compared to 37% (7/19) of those from MSM (odds ratio (OR), 6.6 [95% confidence interval (CI), 1.7 to 26.7]; P=0.002). In addition, 83% (50/60) of the strains were identified as macrolide resistant with an A2058G mutation in the 23S rDNA gene. 90% (35/39) of the strains from heterosexuals were macrolide resistant compared to 58% (11/19) of those from MSM; the odds of having the resistant mutation was considerably higher in the former (OR, 6.4 [95% CI, 1.3 to 33.5]; P=0.02). Heterosexual women and heterosexual men showed similar distributions, and the association remained the same when restricted to men. The strain type distribution and the prevalence of macrolide resistance differed substantially between syphilis strains from heterosexual cases and MSM cases, suggesting distinct epidemiologic profiles for the two communities and provides important insight into the dynamics of syphilis in Japan.
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