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We assessed the public health impact and value of vaccinating boys and men with the quadrivalent HPV vaccine in the United States. We used mathematical population models, accounting for both the direct and indirect protective effects of vaccination. Inputs for the models were obtained from public data sources, published literature, and analyses of clinical trial data. Compared with a program of vaccinating girls and women only, including boys and men 9–26 years of age would further decrease the cumulative mean number of genital wart cases, cervical intraepithelial neoplasia 2/3 cases, cancer cases, and cancer deaths by 5,146,000, 708,000, 116,000, and 40,000, respectively, within 100 years. The mean cost-effectiveness ratio (2008 US $) of this strategy was $25,700 (range: 13,600–48,800) per QALY gained if vaccination protects against all HPV 6/11/16/18-associated diseases, and $69,000 (range: 37,700 …