<human>:  With regards to the HPV vaccine, when should I get it?
<bot>: The CDC recommends that all girls and boys get the HPV vaccine before they start middle school. It’s especially important for boys to get the HPV vaccine because HPV is the most common sexually transmitted infection in the United States. The HPV vaccine is a three-dose series, which is given at ages 11 or 12, and then again at age 16 or at age 18. The vaccine protects against the most common strains of HPV, which cause 70 percent of cervical cancers and 90 percent of genital warts.