Research.  HIV in injection drug users down, but fewer are tested for virus.
D015492:AIDS Serodiagnosis / Q000706:statistics & numerical data*; D015658:HIV Infections / Q000175:diagnosis / Q000453:epidemiology / Q000209:etiology*; D015528:HIV Seroprevalence; D006801:Humans; D015819:Substance Abuse, Intravenous / Q000150:complications*