TABLE 1.

Food exposures and risk of developing illness in the index cluster in an outbreak of cyclosporiasis in Ontario in 1996

Food item*	Attack rate in the exposed†	Attack rate in unexposed	Relative risk	P
Strawberry flan with raspberries and blueberries	0.81 (30/37)	0.38(3/8)	2.16	0.02‡
Caesar salad	0.71 (24/34)	0.5 (5/10)	1.42	0.27‡
Chulent (booked beef)	0.77 (20/26)	0.64 (14/22)	1.20	0.31
Corned beef	0.77 (17/22)	0.65 (17/26)	1.18	0.37
Chicken	0.83 (15/18)	0.67 (20/30)	1.25	0.32‡
Egg salad	0.71 (15/21)	0.71 (20/28)	1.00	1.00
Water	0.78 (14/18)	0.62 (16/26)	1.26	0.26
Tea	0.71 (12/17)	0.70 (21/30)	1.01	0.97
Tomato salad	0.67 (4/6)	0.73 (29/40)	0.92	1.00‡

^*Food items shown include all the fresh produce and the cooked items with highest relative risk and statistical significance;

^†People who recalled eating the food item. The food items are ranked by frequency of exposure in cases.

^‡Fisher's exact p-value