ATLANTA (AP) — A vaccine against a cervical cancer virus cut infections in teen girls by half in the first study to measure the shot's impact since it came on the market. The results impressed health experts and a top government top health official called them striking.

The research released Wednesday echoes studies done before the HPV vaccine became available in 2006. But the new study is the first evidence of just how well it works now that it is in general use.

Only about half of teen girls in the U.S. have gotten at least one dose of the expensive vaccine, and just a third of teen girls have had all three shots, according to the latest government figures.

"These are striking results and I think they should be a wake-up call that we need to increase vaccination rates," said Dr. Thomas Frieden, director of the Centers for Disease Control and Prevention.

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