1. National Center for Environmental Health, Centers for Disease Control and Prevention, Chamblee, Georgia, USA
2. Foreign Agricultural Service, U.S. Department of Agriculture, Nairobi, Kenya
3. Office of Plant and Dairy Foods, Center for Food Safety and Applied Nutrition, Food and Drug Administration, College Park, Maryland, USA
4. Kenya National Public Health Laboratory, Nairobi, Kenya
5. Kenya Field Epidemiology and Laboratory Training Program, and
6. Preventive and Promotive Health, Kenya Ministry of Health, Nairobi, Kenya
7. Centers for Disease Control and Prevention, Kenya Office, Nairobi, Kenya