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The vaccines have been shown to offer 100 percent protection against the development of cervical pre-cancers and genital warts caused by the HPV types in the vaccine, with few or no side effects. The protective effects of the vaccine are expected to last a minimum of 4.5 years after the initial vaccination.
The HPV vaccine is approved for people 9 to 26 years old: 1  For kids and teens ages 9-14, the vaccine is given in two shots over a 6- to 12-month period. 2  For teens and young adults ages 15-26, it is given in three shots over a 6-month period.