Abstract
1Enteric Diseases and Food Safety Research Unit, National Animal Disease Center, Agricultural Research Service, United States Department of Agriculture, Ames, Iowa 50010;
2Unité Bactériologie Moléculaire et Médicale, Institut Pasteur, 75724 Paris cedex 15, France;
4Unité des Entérobactéries, Institut Pasteur, 75724 Paris cedex 15, France;
3School of Veterinary Studies, Murdoch University, Murdoch, Western Australia 6150, Australia