Table 2. Escherichia coli O157 outbreaks by setting (n = 357), United States, 2003–2012.

Transmission source	Setting/no. outbreaks
	Restaurant/ banquet facility	Home	Institutional*	Fair/petting zoo	Recreational area/facility†	Other‡	Unknown	Total
Food	73	60	16	2	0	32	39	222
Beef	15	34	3	0	0	9	8	69
Poultry	0	0	1	0	0	0	0	1
Other meat	1	5	0	0	0	0	0	6
Dairy	0	2	0	0	0	11	0	13
Leafy vegetables§	13	4	3	0	0	2	4	26
Fruits	0	2	0	1	0	2	0	5
Sprouts	1	0	0	0	0	0	0	1
Nuts	0	1	0	0	0	0	0	1
Other foods	13	6	0	0	0	2	3	24
Food unknown	30	6	9	1	0	6	24	76
Animal contact	0	1	2	17	0	4	15	39
Person-to-person	0	2	17	0	0	0	20	39
Water	0	2	2	0	7	4	0	15
Other or unknown	0	0	0	0	0	0	42	42
All outbreaks	73	65	37	19	7	38	116	357

*Institutional setting comprises camp, daycare, hospital, nursing home, prison, school, church, and workplace cafeteria.
†Recreational area/facility comprises county and state park, beach, and a sports complex.
‡Other settings comprise a grocery store, commercial products, a 4H steer competition, communities, a farm, a National Western Stock Show, a public outdoor area, and a club.
§Setting was not available for 3 outbreaks involving leafy vegetables.