A sexually transmitted disease (STD) is a disease or infection that may be passed (transmitted) from person to person, usually during sexual activity. This may happen by way of saliva, semen, blood, vaginal mucus, or urine. Common STDs include:
- HIV and AIDS.
- Genital herpes.
- Hepatitis B and C.
- Human papillomavirus (HPV).
- Pubic lice.
- Bacterial vaginosis.
