The field of HIV prevention continues to evolve at an impressive pace. This book provides a synthesis of the latest information on this fast changing area from a distinguished set of experts in all fields of HIV prevention – biomedical as well as behavioral. It covers various aspects of HIV prevention, including treatment-as-prevention, prevention in vulnerable groups as well as forecasting likely impacts of various combination interventions into the future through mathematical modeling. The result is a topical reference work that is of value to anyone active in the field of HIV prevention, including students, epidemiologists, public health researchers, medical practitioners and other healthcare professionals as well as economists and policy makers at all levels.