Also known as Prevention For Positives (P4P), this is a five-year, NIMH-funded study that tests two interventions  — one behavioral and one biomedical — to prevent HIV and STI (sexually transmitted infection) transmission among HIV- and/or STI-positive men who have sex with men in Lima, Peru.

This study evaluates two interventions carried-out simultaneously – one which is community-based and focuses on behavioral modification, and the other to improve access and service coverage for contacts of index cases for various sexually transmitted infections (STIs) – in order to prevent the transmission of HIV and STIs in Peru. Comunidades Positivas, the behavioral intervention, is designed to reduce the frequency of unprotected sex with non-primary partners. The biomedical intervention is designed to evaluate the effectiveness of enhanced partner therapy for incident STIs with the goal of reducing re-infection rates and therefore, incident STIs.