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HPV vaccine: Who needs it, how it works

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Human papillomavirus, also called HPV, is spread by sexual activity. Some strains of HPV cause genital warts. Other HPV strains can cause cancers.

Most of the time, the body can find and clear out HPV. But if the virus stays in the body for a long time, it can cause cancer. Getting vaccinated against HPV helps prevent cancer in men and women.

Here's what you need to know about the HPV vaccine.