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Community action is needed to slow the spread of the human immunodeficiency virus among injection drug users. This article discusses the role of the community and reviews four models of preventing the acquired immunodeficiency syndrome (AIDS) among drug users drug treatment clinic-based interventions, community-based interventions and community-level interventions Interventions at the community level are needed to change social norms and to maximize the prospect of preventing AIDS. The obstacles to these interventions include poverty, lack of social capital, multiple social problems in communities where drug use is prevalent and lack of community consensus about appropriate types of action. To overcome these impediments, psychologists in the addictions can identify the strengths in communities where drug use is prevalent and catalyze participation in community-level interventions to prevent the spread of AIDS.