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1. Syphilis - Symptoms and causes - Mayo Clinic

   Syphilis is an infection caused by bacteria. Most often, it spreads through sexual contact. The disease starts as a sore that's often painless and typically ...

2. Sexually transmitted diseases (STDs) - Symptoms and causes - Mayo Clinic

   They are spread mainly by sexual contact. STIs are caused by bacteria, viruses or parasites. A sexually transmitted infection may pass from person to person in ...

3. Sexually transmitted diseases (STDs) - Diagnosis and treatment - Mayo Clinic

   Testing for an STD or sexually transmitted infection in someone who doesn't have symptoms is called screening. Most of the time, STI screening is not a routine ...