A new CDC study estimates that one in four (26 percent) young women between the ages of 14 and 19 in the United States – or 3.2 million teenage girls – is infected with at least one of the most common sexually transmitted diseases (human papillomavirus (HPV), chlamydia, herpes simplex virus, and trichomoniasis). The study, presented today at the 2008 National STD Prevention Conference, is the first to examine the combined national prevalence of common STDs among adolescent women in the United States, and provides the clearest picture to date of the overall STD burden in adolescent women. Led by CDC’s Sara Forhan, M.D., M.P.H., the study also finds that African-American teenage girls were most severely affected. Nearly half of the young African-American women (48 percent) were infected with an STD, compared to 20 percent of young white women. The two most common STDs overall were human papillomavirus, or HPV (18 percent), and chlamydia (4 percent). Data were based on an analysis of the 2003-2004 National Health and Nutrition Examination Survey. “Today’s data demonstrate the significant health risk STDs pose to millions of young women in this country every year,” said Kevin Fenton, M.D., director of CDC’s National Center for HIV/AIDS, Viral Hepatitis, STD and TB Prevention. “Given that the health effects of STDs for women – from infertility to cervical cancer – are particularly severe, STD screening, vaccination and other prevention strategies for sexually active women are among our highest public health priorities.”“High STD infection rates among young women, particularly young African-American women, are clear signs that we must continue developing ways to reach those most at risk,” said John M. Douglas, Jr., M.D., director of CDC’s Division of STD Prevention. “STD screening and early treatment can prevent some of the most devastating effects of untreated STDs.” CDC recommends annual chlamydia screening for sexually active women under the age of 25. CDC also recommends that girls and women between the ages of 11 and 26 who have not been vaccinated or who have