Why is the HPV vaccine recommended at such an early age?

A new version of the human papillomavirus (HPV) vaccine protects against nine types of cancer – five more than the existing vaccine, according to new research in the New England Journal of Medicine. But, according to an accompanying NEJM editorial, there is still much work to be done in convincing Americans to have their pre-teen children vaccinated against HPV, with only 57 percent of girls having received the first dose. http://www.umassmed.edu/news/news-arc...