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HPV is short for human papilloma virus. HPVs are a large group of related viruses. Each virus in the group is given a number, which is called an HPV type.

HPV can be passed from one person to another by skin-to-skin contact, such as occurs with sexual activity. HPV can be spread even when an infected person has no visible signs or symptoms. HPV infection is very common. Most men and women who have ever had sex get at least one type of genital HPV at some time in their lives. Anyone who has had sex can get HPV, even if it was only with only one person, but infections are more likely in people who have had many sex partners.  Even if a person delays sexual activity until marriage, or only has one partner, they are still at risk of HPV infection if their partner has been exposed.

Most HPV types cause warts on the skin, such as on the arms, chest, hands, or feet. Other types are found mainly on the body鈥檚 mucous membranes. Mucous membranes are the moist surface layers that line organs and parts of the body that open to the outside, such as the vagina, anus, mouth, and throat. The HPV types found on mucous membranes are sometimes called genital HPV. They generally do not live on the skin.

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