1. Poultry Microbiological Safety and Processing Research Unit, U.S. National Poultry Research Center, Agricultural Research Service United States Department of Agriculture Athens Georgia USA
2. Bacteriology, Mycology and Immunology Department, Faculty of Veterinary Medicine Mansoura University Mansoura Egypt
3. Egg Safety and Quality Research Unit, U.S. National Poultry Research Center, Agricultural Research Service United States Department of Agriculture Athens Georgia USA