1. Department of Veterinary Pathology, College of Veterinary Medicine, University of Georgia, Athens, GA
2. School of Veterinary Medicine, Department of Clinics and Surgery, Universidade Federal de Minas Gerais, MG, Brazil
3. Southeast Poultry Research Laboratory, USDA Agricultural Research Service, Athens, GA
4. Poultry Microbiology Safety Research Unit, Russell Research Center, US Department of Agriculture, Agricultural Research Service, Athens, GA