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Picture of Primary Syphilis: This image displays a painless ulcer with a red base, typical of primary syphilis. Divider line
This image displays a painless ulcer with a red base, typical of primary syphilis.
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Who's At Risk
Syphilis infection can occur in any sexually active person, but it tends to affect young men (15–25 years old) who have sex with other men, sex workers, and people who have sex with sex workers. The disease is more common in the southern states and in urban areas in general. 
Last Modified: 3 Mar 2008
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