The introduction of the human papillomavirus vaccine in 2006 was credited with the 56% decline in the rate of 14- to 19-year-old girls in the U.S. infected with any of the four HPV strains, according to a CDC report released on Wednesday. Since vaccination rates among young women remain low, this decline may be due to herd immunity, the lead researcher said. The findings appear in The Journal of Infectious Diseases.

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