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  1. About Sexually Transmitted Infections (STIs) | STI | CDC

  2. Sexually transmitted infections (STIs)

  3. Sexually transmitted diseases (STDs) - Symptoms and causes

  4. Sexually transmitted infection - Wikipedia

  5. Sexually Transmitted Infections (STIs) | STI | CDC

  6. Sexually Transmitted Infections - StatPearls - NCBI Bookshelf

  7. Sexually transmitted disease (STD) symptoms - Mayo Clinic