Strong Herd Protection Evident 17 Years After HPV Vaccine Introduction
A large cross-sectional study published in JAMA Pediatrics evaluated the long-term impact of HPV vaccination over 17 years in adolescent girls and young women, many at elevated risk for HPV infection. The findings demonstrate both high population-level effectiveness and clear herd protection.
Among vaccinated participants, positivity for HPV types targeted by the bivalent and quadrivalent vaccines declined by more than 90%, while unvaccinated individuals also showed significant reductions, indicating decreased transmission within the wider community. For the newer 9-valent vaccine, protection in vaccinated individuals was substantial, though herd effects were more modest, likely due to lower overall uptake.
The results confirm that widespread vaccination reduces HPV circulation not only among vaccine recipients but also among unvaccinated populations, reinforcing the vaccine’s role in cancer prevention and public health strategies
