AIDS prevention.
D000163:Acquired Immunodeficiency Syndrome / Q000517:prevention & control* / Q000635:transmission; D005060:Europe; D015658:HIV Infections / Q000517:prevention & control* / Q000635:transmission; D006266:Health Education; D006801:Humans; D012307:Risk Factors; D015819:Substance Abuse, Intravenous / Q000150:complications / Q000517:prevention & control*