The sooner girls are vaccinated against human papillomavirus (HPV), the lower their future risk of cervical cancer, a new study finds.

Compared to unvaccinated women, the risk of cervical cancer was 87% lower among those who received the bivalent vaccine Cervarix at ages 12 or 13. By contrast, it was 62% lower in those who got the vaccine at ages 14-16 and 34% lower those vaccinated at ag...