Dr. Rheingans current research focuses on the social, economic and environmental determinants of water and sanitation related illness in developing countries. This includes studies of disparities in water and sanitation risks at the scale of urban slums in Kenya and across sub-Saharan Africa. He is currently leading a randomized controlled trial in western Kenya to measure the impact of school-based water and sanitation improvements on educational and health outcomes. His research also includes a series of multi-country studies on the effectiveness and cost-effectiveness of vaccination against rotavirus diarrhea, including a study of the disparities in benefits and cost-effectiveness of such programs. His new research initiatives include exploring the impact of school-based water, sanitation and hygiene on adolescent girls, as well as modeling spatial distribution and transmission of sanitation related pathogens.