1. Bacteriology and Enteric Diseases Program, National Microbiology Laboratory, Public Health Agency of Canada, Winnipeg, Manitoba, Canada
2. British Columbia Centres for Disease Control Public Health Microbiology & Reference Laboratory, Vancouver, British Columbia, Canada
3. Cadham Provincial Laboratory, Winnipeg, Manitoba, Canada
4. Public Health Ontario Laboratories, Toronto, Ontario, Canada
5. Laboratoire de Santé Publique du Québec, Sainte-Anne-de-Bellevue, Québec, Canada
6. Provincial Laboratory for Public Health, Edmonton, Alberta, Canada
7. Saskatchewan Disease Control Laboratory, Regina, Saskatchewan, Canada
8. Queen Elizabeth II Health Sciences Centre, Halifax, Nova Scotia, Canada
9. Dr. G. L. Dumont Hospital, Moncton, New Brunswick, Canada
10. Centre for Communicable Diseases and Infection Control, Public Health Agency of Canada, Ottawa, Ontario, Canada
11. Department of Medical Microbiology, University of Manitoba, Winnipeg, Manitoba, Canada