HPV vaccine

Most cervical cancers are associated with human papillomavirus (HPV), a sexually transmitted infection. Widespread immunization with the HPV vaccine could reduce the impact of cervical cancer worldwide. Here’s what you need to know about the HPV vaccine.

Various strains of HPV spread through sexual contact and are associated with most cases of cervical cancer. Gardasil 4 is an HPV vaccine approved by the U.S. Food and Drug Administration and can be used for both girls and boys. This vaccine can prevent most cases of cervical cancer if given before a girl or woman is exposed to the virus. In addition, this vaccine can prevent vaginal and vulvar cancer in women, and can prevent genital warts and anal cancer in women and men. In theory, vaccinating boys against the types of HPV associated with cervical cancer might also help protect girls from the virus by possibly decreasing transmission. Certain types of HPV have also been linked to cancers in the mouth and throat, so the HPV vaccine likely offers some protection against these cancers, too.

The HPV vaccine is routinely recommended for girls and boys ages 11 or 12, although it can be given as early as age 9. It’s ideal for girls and boys to receive the vaccine before they have sexual contact and are exposed to HPV. Research has shown that receiving the vaccine at a young age isn’t linked to an earlier start of sexual activity. Once someone is infected with HPV, the vaccine might not be as effective or might not work at all. Also, response to the vaccine is better at younger ages than it is at older ages.

The Centers for Disease Control and Prevention (CDC) now recommends that all 11- and 12-year-olds receive two doses of HPV vaccine at least six months apart, instead of the previously recommended three-dose schedule. Younger adolescents ages 9 and 10 and teens ages 13 and 14 also are able to receive vaccination on the updated two-dose schedule. Research has shown that the two-dose schedule is effective for children under 15. Teens and young adults who begin the vaccine series later, at ages 15 through 26, should continue to receive three doses of the vaccine.

Yes. Even if you already have one strain of HPV, you could still benefit from the vaccine because it can protect you from other strains that you don’t yet have. However, none of the vaccines can treat an existing HPV infection. The vaccines protect you only from specific strains of HPV you haven’t been exposed to already.

Overall, the effects are usually mild. The most common side effects of HPV vaccines include soreness, swelling or redness at the injection site. Sometimes dizziness or fainting occurs after the injection. Remaining seated for 15 minutes after the injection can reduce the risk of fainting. In addition, headaches, nausea, vomiting, fatigue or weakness also may occur.

Yes. The HPV vaccine isn’t intended to replace Pap tests. Routine screening for cervical cancer through regular Pap tests beginning at age 21 remains an essential part of a woman’s preventive health care.

HPV spreads through sexual contact — oral, vaginal or anal. To protect yourself from HPV, use a condom every time you have sex. In addition, don’t smoke. Smoking raises the risk of cervical cancer. To detect cervical cancer in the earliest stages, see your health care provider for regular Pap tests beginning at age 21. Seek prompt medical attention if you notice any signs or symptoms of cervical cancer — vaginal bleeding after sex, between periods or after menopause, pelvic pain, or pain during sex.