Long-term effectiveness and immunogenicity of quadrivalent HPV vaccine in young men: 10-year end-of study analysis.

1553 Background: The quadrivalent human papillomavirus (qHPV) vaccine prevented HPV6/11/16/18-related persistent infection and external genital lesions in young men in an international, randomized, placebo-controlled pivotal efficacy study. We report the end-of-study analysis of a long-term follow up (LTFU) extension study that assessed the effectiveness and immunogenicity of the qHPV vaccine through 10 years after the first dose. Methods: In...