In 2007, 25.1% of girls ages 13 to 17 got at least one dose of Gardasil, a vaccine against human papillomavirus, which can cause cervical cancer, according to a CDC report. The result was part of a survey to track immunization rates in the age group. Immunization advocates had hoped for a higher rate, saying the vaccine could significantly decrease annual mortality from cervical cancer in the U.S.

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