1. Division of Animal and Food Microbiology, Office of Research, Center for Veterinary Medicine, U.S. Food & Drug Administration, Laurel, Maryland.
2. USDA, Antimicrobial Resistance Research Unit, Agricultural Research Services, Athens, Georgia.
3. USDA, Animal and Plant Health Inspection Service, Veterinary Services, Centers for Epidemiology and Animal Health, Fort Collins, Colorado.
4. USDA, Food Safety and Inspection Service, Zoonotic Diseases and Residue Surveillance Division, Washington, D.C.