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Are 2 HPV Shots as Good as 3 for Preteen Girls?

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

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But study author Dr. Simon Dobson, a clinical associate professor with the vaccine evaluation center at the University of British Columbia, said the results are encouraging because they suggest that younger girls could get two doses to prime their immune systems against HPV, and then get a later dose to boost that response closer to the time they might become sexually active.

"It raises the possibility that you could give two doses early in preadolescence, and then wait and give the third dose later in adolescence when the girls are going to be closer to the time when they're most likely to need protection against HPV," Dobson said.

Two doses would also save money, a key consideration especially in countries where resources are scarce. According to the CDC, the Gardasil vaccine cost about $130 a dose in 2012.

Until more is known, however, experts say girls should get all three doses.

Kahn said doctors don't know if two doses will be enough to fully protect teenage girls.

"We need data on girls older than 13. Because even though the vaccine is recommended to be targeted to 11- to 12-year-olds, girls in the 13- to 17-year-old age range are actually most likely to be vaccinated. We would need to see data on immunogenicity or immune response in the 13- to 17-year-old age range," said Kahn.

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.

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