"A CDC study examining HPV prevalence among sexually active females aged 14 to 24 demonstrated no net change in overall HPV infection rates following the introd

"A CDC study examining HPV prevalence among sexually active females aged 14 to 24 demonstrated no net change in overall HPV infection rates following the introduction of the vaccine." Not all HPV strains cause cancer, so it's not surprising that a vaccine that targets cancer-causing strains would decrease the prevalence of those strains, and, as a side effect, increase the prevalence of other strains. This is not a bug, this is the whole point.