1. Poultry Microbiology Safety Research Unit (PMSRU), Richard B. Russell Agricultural Research Center, Agricultural Research Service, U.S. Department of Agriculture, 950 College Station Road, Athens, Georgia 30605
2. Animal Biosciences and Biotechnology Laboratory (ABBL), Animal and Natural Resources Institute, Building 230, Room 104, BARC-East, Agricultural Research Service, U.S. Department of Agriculture, 10300 Baltimore Avenue, Beltsville, Maryland 20705-2350