Practically all cervical cancer is caused by HPV, mainly from a strain covered by the vaccine.
The newest version of Gardasil, which got FDA approval in December 2014, protects against nine strains of HPV and 90% of all cancers associated with the virus.
This may have seemed premature and left a “bitter taste” for policymakers, although this new research cannot explain why HPV vaccines have been treated differently than previous vaccines said Jason Schwartz, one of the authors of the letter and health policy researcher at Princeton University.
A large body of evidence supports the safety and efficacy of the vaccine, and several studies have found that getting the shots does not lead to kids engaging in more risky sexual behavior.
Parents would have been able to opt-out their children.