[HIV prevention in HIV-positive drug addicts. A methadone-supported model].

In Switzerland, an estimated 15-25% of intravenous drug users (IVDUs) are infected with human immunodeficiency virus (HIV). It has been suggested that reduction of HIV-transmission-prone behavior could be achieved in so-called "early intervention programs". Few public prevention programs have so far been targeted to HIV-infected IVDUs. Socially marginalized, jobless, street-based, HIV-infected IVDUs are those hardest to reach for education programs: it was the hypothesis that they can be motivated for HIV-prevention efforts by methadone-based comprehensive social and medical care. The program was established by integrating one additional social worker in an outpatient clinic for infectious diseases in St. Gallen, a city with a population of 70,000 inhabitants in eastern Switzerland. Access to the 29 clients of this study (10 women, 19 men) was facilitated by offering methadone treatment (follow-up 5 to 29 months). Abstinence from additional illegal drugs was not required. Methadone, plus social care and medical treatment was provided by a small team consisting of a social worker, a physician and a nurse. A gradual approach was chosen to establish a working relationship with clients. The first attempt was to satisfy basic medical needs, housing, and financial support as well as to strengthen relevant personal relationships. Once trusting cooperation was established, reduction of transmission-prone behavior was targeted. The results show that social performance can be greatly improved by integrated social, psychological and medical assistance: for the 16 initially homeless housing was found, 14 found a job and for all but 2 basic financial support was eventually guaranteed. Self-reported drug abuse was markedly reduced, as was transmission-prone behavior by prostitution, unsafe sex practices, needle sharing and improper disposal of used syringes. Breaking the isolation of socially marginalized IVDUs seems to be the important move to enhance their social responsibility as carriers of HIV.