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  1. 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 ...

  2. Sexual health STD prevention - Mayo Clinic

    STIs are also called sexually transmitted diseases (STDs). You often can't tell if someone has an STI. Many STIs cause no symptoms. In fact, many people who ...

  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 ...

  4. STD testing: What's right for you? - Mayo Clinic

    Find out how your risk factors affect the types of tests you'll likely need for sexually transmitted infections.