AIDS and drug addiction is a topic of great and growing concern. AIDS first appeared among intravenous drug users in Europe in 1984, three years after the first cases were seen among homosexuals. This epidemic has spread more rapidly among intravenous drug users than in any other risk group. The high rates of HIV-1 seroprevalence among drug users in France, Italy, and Spain account for 85% of the total number of AIDS in intravenous drug users in Europe. It is anticipated that HIV-infected drug users will soon place a heavy burden on both drug treatment facilities and specialized health care...