Impact of community-based interventions on HIV: the next steps.

Community based interventions increase knowledge scores and also have an impact of sexual behaviours with regard to HIV. However the problem remains as to how best to scale up these interventions and how best to overcome real or perceived barriers to their uptake. Community based interventions have multiple components and some will be more difficult to widen out than others. Those that involve face to face or one to one sessions will be most expensive and so most difficult to scale up. If some interventions can be implemented by means of custom computerized risk reduction programmes, then roll out on a large scale should be less problematic.