Prisons and HIV.
D003430:Cross-Sectional Studies; D004739:England; D015658:HIV Infections / Q000453:epidemiology / Q000635:transmission*; D015528:HIV Seroprevalence; D006801:Humans; D015994:Incidence; D011330:Prisons; D015819:Substance Abuse, Intravenous / Q000150:complications* / Q000453:epidemiology