Figure 39

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Pie graph showing the distribution of primary and secondary syphilis cases by sex and sex of sex partners in the United States in 2018. Men accounted for 85.7% of reported primary and secondary syphilis cases. Of 35,063 reported primary and secondary syphilis cases in 2018, 18,760 (53.5%) were among men who have sex with men, including 16,905 (48.2%) cases among men who had sex with men only and 1,855 (5.3%) cases among men who have sex with both men and women. Overall, 5,416 (15.4%) cases were among men who have sex with women only, 4,995 (14.2%) were among women, 5,858 (17%) were among men without information about sex of sex partners, and 34 (0.1%) were cases reported with unknown sex. Among the 24,176 male cases with information on sex of sex partners, 77.6% occurred among men who have sex with men.