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AP Photo/John AmisLauren Fant, left, 18, winces as she has her third and final application of the HPV vaccine administered by nurse Stephanie Pearson Dec. 18 2007, in Marietta, Ga. The vaccine helps prevent cervical cancer in girls by blocking the HPV virus, which researches found is by far the most common sexually transmitted infection in teen girls.

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CDC study says at least 1 in 4 teen girls has a sexually transmitted disease; HPV most common

• By ncs-import
• March 11, 2008