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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

    ... cancer. Cervical cancer is often caused by certain HPV strains. Experts recommend that women have a Pap test every three years starting at age 21. After age ...