World health organization

10 facts on sexually transmitted infections

A husband touches the belly of his pregnant wife as they sit on a bench together.

Sexually transmitted infections (STIs) are mostly spread from one infected person to another through sexual intercourse. Some infections may also be transmitted from mother to child during pregnancy and childbirth. Another way that infections are passed on is through the sharing of blood products or tissue transfers. Some diseases caused by STIs include syphilis, AIDS and cervical cancer.

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