1. Bacterial Epidemiology and Antimicrobial Resistance Research Unit, Agricultural Research Service, U.S. Department of Agriculture, Richard B. Russell Research Center, Athens, Georgia.
2. Centers for Disease Control and Prevention, Atlanta, Georgia.
3. Ontario Veterinary College, Guelph, ON, Canada.
4. Public Health Agency of Canada, Winnipeg, MB, Canada.
5. Center for Veterinary Medicine, U.S. Food and Drug Administration, Laurel, Maryland.