The first national study of common sexually transmitted diseases among teenage women has found that one in four are infected with at least one of the diseases, federal health officials reported on Tuesday.
Nearly half of African-American teenage women were infected with at least one of the diseases monitored in the study — human papillomavirus (H.P.V.), chlamydia, herpes simplex type 2 and trichomoniasis, a common parasite.
That figure compared with 20 percent of white teenage women.
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