Abstract
Central in the work are six papers describing the sexual behaviour of populations at increased risk for HIV infection as well as opportunities for HIV prevention. The first two papers investigate the sexual behaviour and contraceptive use of youth in the Balkans. The third paper discusses the conditions required to unlock the potential of HIV prevention through sport-based programmes, while the next paper is a case study of the impact of the AIDS awareness and prevention project of the Mathare Youth Sport Association in Kenya on risky sexual behaviour of youth in Mathare. In the final two papers, epidemiological models are developed to investigate role of concurrent partnerships in the spread of HIV. Rather than to model concurrency explicitly, the null hypothesis – serial monogamy – is modelled, and the doubling of HIV epidemics under serial monogamy is compared to the observed doubling time of the South African HIV epidemic. Additionally, an individual-based stochastic model (SIMPACT) is developed to study the impact of HIV prevention interventions in sexual networks characterised by concurrency and complex age mixing patterns.
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