Although the number of 11- to 26-year-olds in the U.S. who got the initial human papillomavirus vaccine significantly increased between 2007 and 2011, just about 40% of girls aged 11 to 17 were vaccinated in each year, a study showed. Researchers looked at clinic visits for the girls and found an average of two to three missed vaccination opportunities annually. The findings were presented at the Pediatric Academic Societies meeting.

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