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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.
âAt the moment, this is a one-dose immunization, but the CDC is now discussing whether children who receive the vaccine at 11 or 12 years old need a booster shot just before college.he HPV vaccine effectively prevents infection with the HPV types responsible for most cervical cancers and can also prevent genital warts. HPV vaccination is most effective during childhood or adolescence, but adults can also benefit from the HPV vaccine.