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The test is used to diagnose infection with syphilis in sexually active persons. Pregnant women also are screened, and many states in the U.S. require a blood test for syphilis when applying for a marriage license to prevent the spread of infection to others, especially a newborn baby.
The first symptoms of syphilis may not be seen immediately. The primary stage begins within 10 days to three months of being infected. A sore appears, usually on the part of the body exposed to your partner’s ulcer. The sore may be painless and go unnoticed, and it disappears within a few weeks.Secondary syphilis begins three to six weeks after the sore appears. It is marked by a skin rash that usually heals in several weeks or months. There may be other symptoms as well, such as fever and sore throat. If untreated, syphilis may continue into a latent stage, during which you have no symptoms and are no longer contagious.