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Sexually transmitted disease
A sexually transmitted disease (STD) is a disease which spreads by having sex. STDs can spread through oral sex or anal sex, or when two people's genitals touch. Today, STDs are usually called sexually transmitted infections (STIs). In the past, they were called venereal diseases (VD).
STDs can be caused by viruses, bacteria, or parasites. Examples of the most common STDs are listed on this page.
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