Phase 3 Study to Evaluate the Safety and Immunogenicity of 9vHPV Vaccine in 9- to 14-Year Old Boys and Girls

This study will evaluate extended 2-dose regimens in 2 different populations: (1) boys and girls 10 to 15 years of age who previously received 1 dose of 9vHPV vaccine and did not complete the series and (2) HPV vaccine-naive boys and girls 9 to 14 years of age compared with young women 16 to 26 years of age who receive a standard 3-dose vaccine regimen.

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