A Phase 3 International, Multicenter, Open-label Study to Evaluate the Safety and Immunogenicity of 9vHPV Vaccine Administered as 2-dose Regimen with Extended Dosing Intervals in 9- to 14-Year-Old Boys and Girls Compared with a Standard 3-dose

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

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