1. Department of Population Medicine, University of Guelph, Guelph, Ontario, Canada.
2. Laboratory of Foodborne Zoonoses, Public Health Agency of Canada, Guelph, Ontario, Canada.
3. Laboratory of Foodborne Zoonoses, Public Health Agency of Canada, Saint-Hyacinthe, Québec, Canada.
4. Department of Diagnostic Medicine/Pathobiology, College of Veterinary Medicine, Kansas State University, Manhattan, Kansas.
5. Saskatchewan Ministry of Agriculture, Regina, Saskatchewan, Canada.
6. Faculté de Médecine Vétérinaire, Université de Montréal, Saint-Hyacinthe, Québec, Canada.