1. a Infectious Diseases Institute, Makerere University, Kampala, Uganda
2. b Division of Foodborne, Waterborne, and Environmental Diseases, U.S. Centers for Disease Control and Prevention, 1600 Clifton Rd. Mailstop H24-11, Atlanta, GA 30329, USA
3. c Waterborne Disease Prevention Branch, Division of Foodborne, Waterborne, and Environmental Diseases, U.S. Centers for Disease Control and Prevention, 1600 Clifton Rd. Mailstop H24-11, Atlanta, GA 30329, USA
4. d Division of Global Health Protection, U.S. Centers for Disease Control and Prevention (CDC), Country Office Kampala, Uganda