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Simple models to evaluate the impact of the cohort effect of the 1965–1975 US sexual revolution on cross-sectional human papillomavirus (HPV) prevalence surveys conducted in 1998, 2008, and 2018 among 5 successive birth cohorts (1939–1974). Model A assumes no risk of reactivation with increasing age, and model B assumes an age-specific increase in reactivation similar to the observed U-shaped HPV prevalence in Morelos, Mexico [38].
