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What are the most common types of syphilis?
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The most common types of syphilis are primary, secondary and latent. Primary syphilis is characterized by a rash that appears at the site of infection and lasts for about two weeks. Secondary syphilis occurs after an incubation period of one to three months following initial exposure and can include symptoms such as fever, sore throat, fatigue and swollen lymph nodes. Latent syphilis is the least common type and is asymptomatic; it can be diagnosed through blood tests.