Definition

A non-infectious recombinant, quadrivalent vaccine prepared from the highly purified virus-like particles (VLPs) of the major capsid (L1) protein of human papillomavirus (HPV) Types 6, 11, 16, and 18 with immunoprophylactic activity. The immunoprohylactic efficacy of L1 VLP vaccines, such as recombinant human papillomavirus quadrivalent vaccine, appear to be mediated by the development of humoral immune responses. HPV Types 16 and 18 account for approximately 70% of cervical cancers and HPV Types 6 and 11 account for approximately 90% of genital warts.