Point and cumulative prevalence of oral HPV infections in the study population.

(a) The average point prevalence for oral HPV infections among individuals at visits 1 through 14 for all HPV types (solid line) and for HPV16 only (dashed line). A dotted grey horizontal line is drawn at 43%, the average point prevalence across visits. B) Cumulative prevalence inclusive of visits 1 through 14 for all HPV types (solid line) and for HPV16 only (dashed line).