12. Human papillomavirus (HPV) vaccines. (HPV4 [Gardasil] and HPV2  [Cervarix]). (Minimum age: 9 years) Routine vaccination:  Administer a 3-dose series of HPV vaccine on a schedule of 0, 1-2, and 6 months to all adolescents aged 11-12 years. Either HPV4 or HPV2 may be used for females, and only HPV4 may be used for males.  The vaccine series can be started beginning at age 9 years.  Administer the second dose 1 to 2 months after the first dose and the third dose 6 months after the first dose (at least 24 weeks after the first dose). Catch-up vaccination:  Administer the vaccine series to females (either HPV2 or HPV4) and males (HPV4) at age 13 through 18 years if not previously vaccinated.  Use recommended routine dosing intervals (see above) for vaccine series catch-up.