AIDS AND SOCIAL NETWORKS: HIV PREVENTION THROUGH NETWORK MOBILIZATION*

Abstract Whereas many infectious diseases are spread through casual contact and contagion, HIV transmission results from risk behaviors that involve close and often intimate contact. As a result, the transmission of HIV is structured by the social relationships within which these contacts are embedded. Hence, social network analysis is especially suitable for understanding the AIDS epidemic. This paper reports the results of a field experiment that compares a network-based HIV prevention intervention, termed a “Peer-Driven Intervention” (PDI), with the standard form of street-based outreach intervention. The results suggest that the network intervention outperforms the standard approach with respect to number of people accessed, reductions in self-reported levels of HIV risk behavior and cost. Finally, the analysis focuses on the network structure of drug injectors and discusses the implications of these structures for understanding both the spread of HIV through social networks and the design of HIV-prev...

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