A Scientific Evaluation of One or Two Doses of a Vaccine Against Human Papillomavirus: Long Term Follow Up of Gardasil9 Recipients in the ESCUDDO Study ("Estudio de Comparación de Una y Dos Dosis de Vacunas Contra el Virus de Papiloma Humano [VPH]")

PRIMARY OBJECTIVES:

I. To estimate the IRD and RR of incident HPV 6/11/16/18/31/33/45/52/58-related 6-months cervicovaginal persistent infection between recipients of single dose and 2 doses of 9vHPV vaccine, 7 to 10 years following HPV vaccination.

II. To estimate the IRD and RR of incident HPV 6/11/16/18/31/33/45/52/58-related 6-months cervicovaginal persistent infection between recipients of single dose and 2 doses of 9vHPV vaccine, 1 to 10 years following HPV vaccination.

OUTLINE: This is an observational study.

Patients undergo vaginal and anal swab self sample collection, blood, urine sample collection, complete questionnaires, and have their medical records reviewed on study.

Inclusion criteria

• * Participation in ESCUDDO base study

• Randomization (excluding the two participants who had major protocol deviations in the ESCUDDO base study) to the Gardasil9 1- and 2-dose arms
• A signed informed consent form for ESCUDDO LTFU.
• Opportunity to complete three total study visits

Exclusion criteria

• * Enrollment cannot occur beyond her 10 year study visit