Abstract
Between 2009 and 2012, the proportion of young women in the United States completing the human papillomavirus (HPV) vaccine doubled. To understand how quickly this increased uptake is affecting women in the United States, we evaluated the prevalence of vaccine-type (VT) HPV strains among young women in national data sets from 2009-2010 and 2011-2012. Among 18-26-year-old women, the prevalence of VT HPV decreased markedly over a short interval, from 15.4% in 2009-2010 to 8.5% in 2011-2012 (prevalence ratio, 0.51; 95% confidence interval, .28-.92), and the prevalence of high-risk VT HPV decreased from 13.1% to 6.5% (0.46; .25-.86). Reductions in HPV-related diseases will probably follow.
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