Vaccinating girls around the ages of nine to thirteen is typically recommended. The vaccines require two or three doses depending on a person's age and immune status. The World Health Organization (WHO) recommends HPV vaccines as part of routine vaccinations in all countries, along with other prevention measures. They additionally prevent some genital warts, with the quadrivalent and nonavalent vaccines that protect against HPV types HPV-6 and HPV-11 providing greater protection. It is estimated that HPV vaccines may prevent 70% of cervical cancer, 80% of anal cancer, 60% of vaginal cancer, 40% of vulvar cancer, and show more than 90% efficacy in preventing HPV-positive oropharyngeal cancers. All HPV vaccines protect against at least HPV types 16 and 18, which cause the greatest risk of cervical cancer. Available HPV vaccines protect against either two, four, or nine types of HPV. Human papillomavirus ( HPV) vaccines are vaccines that prevent infection by certain types of human papillomavirus (HPV).
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