title: 20% of youth with HIV didn't know they were infected at first sexual experience: NIH-funded study underscores need for counseling on healthy practices.
mesh_terms: D000293:Adolescent; D002648:Child; D015658:HIV Infections / Q000453:epidemiology / Q000523:psychology*; D006679:HIV Seropositivity / Q000453:epidemiology / Q000523:psychology*; D006801:Humans; D012731:Sex Counseling; D012725:Sexual Behavior / Q000523:psychology* / Q000706:statistics & numerical data; D014481:United States / Q000453:epidemiology