1. Division of Foodborne, Waterborne, and Environmental Diseases, Centers for Disease Control and Prevention, Atlanta, Georgia;
2. WHO, Addis Ababa, Ethiopia;
3. Somali Regional Health Bureau, Jijiga, Ethiopia;
4. Ethiopia Public Health Institute, Federal Ministry of Health, Addis Ababa, Ethiopia;
5. Federal Ministry of Health, Addis Ababa, Ethiopia;
6. US Centers for Disease Control and Prevention, Addis Ababa, Ethiopia