The research shows Gardasil reduced the reoccurrence of HPV-related diseases by 46 percent.
The Centers for Disease Control and Prevention says the human papilloma virus is the most common sexually transmitted infection. It usually clears on its own. But when it doesn't, It can lead to genital warts and cervical cancer.
Merck, which manufactures Gardasil, funded the study. It is published in this week's British Medical Journal.