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A chronic infectious liver disease with several different types. Hepatitis A, B and C are the most common and can all be transmitted sexually. All require medical care. Vaccines are available for hepatitis A and B.

How well something works under ideal or controlled conditions, like efficacy proven through scientific study.

Menstruation, infections and health conditions, birth control, abortion, vaccinations, safer sex and other preventative sexual health practices.

A birth control device which is inserted into the vagina to cover the cervix and prevent sperm from entering. Diaphragms, cervical caps and contraceptive sponges are kinds of cervical barriers.