[1] Hlth Canada, Foodborne Waterborne & Zoonot Infect Div, Lab Ctr Dis Control, Field Epidemiol Training Program, Guelph, ON N1G 5B2, Canada
[2] Hlth Canada, Div EnterFoodborne & Waterborne Dis, Guelph, ON N1G 5B2, Canada
[3] Univ Guelph, Dept Populat Med, Guelph, ON N1G 2W1, Canada
[4] Ontario Minist Hlth & Long Term Care, Toronto, ON, Canada
[5] Hlth Canada, Natl Lab Enter Pathogens, Winnipeg, MB, Canada
[6] British Columbia Ctr Dis Control, Vancouver, BC, Canada