Girls May Need Fewer Gardasil Shots, Study Suggests

Preteens appear to get same protection with two doses of HPV vaccine as young women who get three

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And although protection from the vaccine appears to last a long time, doctors still aren't sure how long, or whether three doses might protect for longer than two.

"The data are encouraging, but it's really too soon to change recommendations based on the results of this one study," Kahn says.

More information

For more on HPV vaccination, head to the U.S. Centers for Disease Control and Prevention.

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