[1] AGR CANADA,FOOD PROD & INSPECT BRANCH,GUELPH N1G 3W4,ON,CANADA
[2] UNIV GUELPH,DEPT POPULAT MED,GUELPH N1G 2W1,ONTARIO,CANADA
[3] HLTH & WELF CANADA,LAB CTR DIS CONTROL,BUR COMMUNICABLE DIS EPIDEMIOL,OTTAWA K1A 0L2,ONTARIO,CANADA
[4] HLTH & WELF CANADA,LAB CTR DIS CONTROL,BUR MICROBIOL,OTTAWA K1A 0L2,ONTARIO,CANADA
[5] ONTARIO MINIST HLTH,TORONTO M5W 1R5,ONTARIO,CANADA
[6] HOSP SICK CHILDREN,TORONTO M5G 1X8,ONTARIO,CANADA
[7] ONTARIO MINIST AGR & FOOD,FERGUS,ON,CANADA