A sexually transmitted infection (STI), also known as a sexually transmitted disease (STD) and formerly venereal disease (VD), is an infection that is spread by sexual activity, especially vaginal intercourse, …

Sexually transmitted diseases (STDs) are caused by sexually transmitted infections (STIs). They are spread mainly by sexual contact. STIs are caused by bacteria, viruses or parasites. A sexually …

Feb 15, 2025 · Anyone who is sexually active is at risk for an STD, regardless of gender, race, social class, or sexual orientation. That said, teenagers and young adults acquire STDs more easily than …

Mar 25, 2024 · A sexually transmitted disease (STD) develops because of an STI and the term implies that the infection has led to some symptom of disease. People sometimes use the terms in one …

Sep 18, 2025 · Some sexually transmitted infections (STIs) can lead to pelvic inflammatory disease (PID), anal or genital warts, and certain cancers. All STDs are caused by an STI. STIs are usually …

Feb 3, 2023 · Sexually transmitted infections (STI) are infections or conditions that you can get from any kind of sexual activity involving your mouth, anus, vagina or penis. Another common name for STIs is …

Jul 15, 2025 · Sexually transmitted infections (STIs) are infections that are passed from one person to another through sexual contact. If not treated, a STI can develop into a sexually transmitted disease …

Sep 26, 2024 · There are many different STDs, but the most common ones in the United States are herpes simplex virus type II (genital herpes), human papilloma virus, chlamydia, gonorrhea, syphilis, …

STDs are infections that are spread from one person to another, usually during vaginal, anal, and oral sex. They’re really common, and lots of people who have them don’t have any symptoms. Without …

Jan 31, 2026 · Sexually transmitted disease (STD), any disease (such as syphilis, gonorrhea, AIDS, or a genital form of herpes simplex) that is usually or often transmitted from person to person by direct …