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A randomized trial of 20,330 girls 12–16 years shows one dose of bivalent or nonavalent HPV vaccine prevents persistent HPV16/18 infection as effectively as two doses over 5 years, with high effectiveness and no safety signals.
This study evaluates immune responses and HPV infection rates in Indian girls after receiving one, two, or three doses of the quadrivalent HPV vaccine, supporting WHO’s recommendation for two doses spaced at least six months apart.
Seventeen years after HPV vaccine introduction, substantial reductions in vaccine-type HPV prevalence confirm strong effectiveness and herd protection among vaccinated and unvaccinated sexually experienced adolescent girls and young women a
