TABLE 1.

Fecal prevalence of E. coli O157:H7 in Ohio dairy herds^a

Bedding	Farm	Fecal prevalence (%) during the sampling period (mo/day):								Overall prevalence (%)
		6/9-6/14	6/15-6/29	6/30-7/13	7/14-7/27	7/28-8/10	8/10-8/24	8/25-9/7	9/8-9/15
Sand	A	0.0	0.0	0.0	0.0	0.0	0.0			0.0
	B	0.0	0.0	3.3	3.3	0.0	10.0			2.8
	C	0.0	0.0	0.0	0.0	0.0	0.0			0.0
	D		13.3	0.0	0.0	0.0	0.0	0.0		2.2
	E		0.0	0.0	6.7	0.0	0.0	0.0		1.1
	F		0.0	0.0	0.0	0.0	0.0	0.0		0.0
	G			0.0	0.0	0.0	0.0	0.0	3.3	0.6
	H			0.0	0.0	0.0	0.0	0.0	0.0	0.0
	I			6.7	13.3	3.3	0.0	6.7	0.0	5.0
	J			0.0	3.3	0.0	3.3	6.7	0.0	2.2
	Avg	0.0	2.2	1.0	2.7	0.3	1.3	1.9	0.8	1.4
Sawdust	K	0.0	0.0	0.0	0.0	3.3	3.3			1.1
	L	3.3	0.0	0.0	0.0	3.3	20.0			4.4
	M	0.0	0.0	0.0	0.0	0.0	10.0			1.7
	N		0.0	0.0	0.0	20.0	0.0	0.0		3.3
	O		0.0	0.0	0.0	3.3	0.0	6.7		1.7
	P		0.0	3.3	0.0	3.3	0.0	0.0		1.1
	Q			6.7	0.0	6.7	0.0	0.0	0.0	2.2
	R			0.0	3.3	0.0	0.0	3.3	13.3	3.3
	S			6.7	0.0	0.0	3.3	6.7	3.3	3.3
	T			0.0	0.0	0.0	6.7	0.0	46.7	8.9
	Avg	1.1	0.0	1.7	0.3	4.0	4.3	2.4	15.8	3.1
Overall avg		0.6	1.1	1.3	1.5	2.2	2.8	2.1	8.3	2.3

^aThirty samples were tested per herd during each sampling period. Average values for farms using sand and sawdust are in boldface.