1. Department of Population Medicine, Ontario Veterinary College, University of Guelph, Guelph, Canada.
2. School of Public Health, University of Alberta, Edmonton, Canada.
3. Roy Romanow Provincial Laboratory (formerly the Saskatchewan Disease Control Laboratory), Regina, Canada.
4. British Columbia Centre for Disease Control, Vancouver, Canada.
5. Centre for Food-borne, Environmental and Zoonotic Infectious Diseases, Public Health Agency of Canada, Guelph, Canada.