Dr. Friedman’s lecture will show how social network analysis has been used to understand how HIV and other infections spread through communities and how public health interventions might better be organized. Dr.Friedman will also discuss how social network interventions can assist in “treatment as prevention” through helping to locate recently infected people to get them into care but also to prevent them from transmitting HIV to others during the highly-risky first year of infection. Dr. Friedman will also discuss whether this aggressive social network intervention leads to harm for people who take part. Finally, he will discuss how these thoughts relate to other infections and conditions.