 The purpose of this study was to determine if delayed dosing of recombinant human papillomavirus HPV quadrivalent Types 6, 11, 16, and 18 vaccine in 9-18 year old girls elicited an equivalent immune response geometric mean titers to HPV 6,11,16, and 18 as measured one month after receipt of a 3rd dose of HPV vaccine when compared to vaccine delivered according to the recommended dosing schedule. 