Table 1. Exposure characteristics of 115¹ primary cases of pork-associated E. coli O157:H7 — Alberta, Canada, July-November, 2014.

Potential exposure sites	Number of patients with exposure to site	Number (%) of patients with pork exposure
Asian-style restaurant(s)2	81	48 (59)
Asian-style market2	3	1 (33)
Sausage producer/retailer2	4	4 (100)
Festival temporary food facility2	7	7 (100)
Meat processor/retailer2	1	1 (100)
Asian-style restaurant(s)3	4	4 (100)
No suspect source facility4	12	10 (83)
Poor historian	3	n/a
Total	115	75 (65)

¹ Four secondary cases excluded
² Facility within implicated pork supplier chain (96/115 primary cases had this exposure)
³ Facility outside implicated pork supplier chain
⁴ After complete exposure assessment