TABLE 1.

E. coli O157 density in fecal samples from cross-sectional survey farms with one or more IMS-positive fecal pats^a

Farm	Sampling date (day.mo.yr)	Locationb	No. of samples	% of samples:
				IMS negative	IMS positive with E. coli O157 count (CFU g−1 feces) of:
					n < 102	102 ≤ n < 103	103 ≤ n < 104	n ≥ 104
E037	07.05.2002	H	52	98.1	1.9	0.0	0.0	0.0
E018	12.06.2002	P	48	97.9	2.1	0.0	0.0	0.0
E036	07.05.2002	P	80	97.5	2.5	0.0	0.0	0.0
E345	17.09.2002	P	36	97.2	2.8	0.0	0.0	0.0
E074	19.08.2002	P	27	96.3	3.7	0.0	0.0	0.0
E303	27.05.2002	P	54	96.3	3.7	0.0	0.0	0.0
E335	19.08.2002	P	48	95.8	0.0	4.2	0.0	0.0
E053	25.06.2002	P	46	95.7	4.3	0.0	0.0	0.0
E064	09.07.2002	P	23	95.7	4.3	0.0	0.0	0.0
E061	03.07.2002	P	23	95.7	0.0	0.0	0.0	4.3
E314	12.06.2002	H	20	95.0	5.0	0.0	0.0	0.0
E373	06.01.2003	P	19	94.7	0.0	0.0	5.3	0.0
E351	14.10.2002	H	15	93.3	6.7	0.0	0.0	0.0
E090	01.10.2002	P	13	92.3	7.7	0.0	0.0	0.0
E306	05.06.2002	H + P	37	91.9	5.4	2.7	0.0	0.0
E341	09.09.2002	H	32	90.6	9.4	0.0	0.0	0.0
E075	19.08.2002	P	27	88.9	11.1	0.0	0.0	0.0
E097	08.10.2002	H	27	88.9	11.1	0.0	0.0	0.0
E349	23.09.2002	P	9	88.9	11.1	0.0	0.0	0.0
E091	01.10.2002	P	35	88.6	11.4	0.0	0.0	0.0
E105	04.11.2002	H	33	87.9	12.1	0.0	0.0	0.0
E081	09.09.2002	H	8	87.5	12.5	0.0	0.0	0.0
E340	09.09.2002	P	31	87.1	12.9	0.0	0.0	0.0
E059	03.07.2002	P	14	85.7	14.3	0.0	0.0	0.0
E360	11.11.2002	H	7	85.7	0.0	0.0	14.3	0.0
E060	03.07.2002	H	47	80.9	19.1	0.0	0.0	0.0
E327	15.07.2002	H	15	80.0	20.0	0.0	0.0	0.0
E355	21.10.2002	H	18	77.8	22.2	0.0	0.0	0.0
E078	26.08.2002	P	64	71.9	26.6	1.6	0.0	0.0
E006	10.06.2002	H + P	46	71.7	28.3	0.0	0.0	0.0
E017	20.05.2002	P	54	68.5	31.5	0.0	0.0	0.0
E365	18.11.2002	H	79	63.3	30.4	3.8	2.5	0.0
E077	26.08.2002	P	24	62.5	4.2	16.7	4.2	12.5
E361	11.11.2002	H	6	50.0	16.7	16.7	16.7	0.0
E304	27.05.2002	P	19	42.1	57.9	0.0	0.0	0.0
E353	14.10.2002	P	27	40.7	51.9	7.4	0.0	0.0
E366	25.11.2002	H	32	40.6	43.8	9.4	0.0	6.3

^aOne sample was taken per fecal pat.

^bH, cattle housed; P, cattle at pasture.