1. Departments of Infectious Disease and Avian Medicine, College of Veterinary Medicine, University of Georgia, Athens, Georgia.
2. Department of Avian Medicine, College of Veterinary Medicine, University of Georgia, Athens, Georgia.
3. Center for Food Safety, College of Agriculture and Environmental Sciences, University of Georgia, Griffin, Georgia.
4. Center for Veterinary Medicine, U.S. Food and Drug Administration, Laurel, Maryland.