Table 2.

Origin, virulence profiles, counts, and PFGE types (PT) of EHEC and EPEC O157:H7 isolated from fecal or environmental samples and counts of generic Escherichia coli in farm G.

Herd visit	Bovine ID	Categorya	Strain ID	Presence of genes b :			EHEC O157:H7 countsc (MPN/g)	Generic E. coli countsc (CFU/g)	PT
				stx1 (subtype)	stx2 (subtype)	eae (subtype)
1	1-b1	YDB	1biss1-1	+ (stx1a)	-	+ (γ1)	<6.0E + 00	n.d.	23
1	1-b18	YDB	1biss18-1	+ (stx1a)	-	+ (γ1)	<6.0E + 00	n.d.	30
1	1-b20	YDB	1biss20-1	+ (stx1a)	-	+ (γ1)	<6.0E + 00	n.d.	22
1	1-b20	YDB	1biss20-6	-	-	+ (γ1)	n.a.	n.d.	16
2	3-G2	YDB	3G2-1	+ (stx1a)	-	+ (γ1)	6.0E + 01	4.5E + 06	19
2	3-G5	YDB	3G5-1	+ (stx1a)	-	+ (γ1)	6.0E + 00	7.0E + 05	17
2	3-G6	YDB	3G6-1	+ (stx1a)	-	+ (γ1)	1.3E + 01	2.3E + 06	21
2	3-G7	YDB	3G7-1	+ (stx1a)	-	+ (γ1)	<6.0E + 00	2.2E + 06	29
2	3-G8	YDB	3G8-1	+ (stx1a)	-	+ (γ1)	<6.0E + 00	4.0E + 06	24
2	3-G13	YDB	3G13-1	+ (stx1a)	-	+ (γ1)	<6.0E + 00	1.4E + 06	26
2	3-G14	YDB	3G14-1	+ (stx1a)	-	+ (γ1)	2.5E + 02	2.4E + 06	18
2	-	E	3GP5-1	+ (stx1a)	-	+ (γ1)	n.a.	n.d.	20
3	4-G2	YDB	4G2-1	-	+ (stx2c)	+ (γ1)	2.5E + 02	5.9E + 05	28
3	4-G11	YDB	4G11-1	-	+ (stx2c)	+ (γ1)	6.0E + 00	2.4E + 05	15
3	4-G12	YDB	4G12-1	-	-	+ (γ1)	n.a.	n.d.	14
3	4-G19	YDB	4G19-1	-	+ (stx2c)	+ (γ1)	n.d.	n.d.	13
3	4-G23	YDB	4G23-1	-	+ (stx2c)	+ (γ1)	n.d.	n.d.	13

^aYBB, young beef bull; YDB, young dairy bull; E, environmental sample.

^b+, detected by PCR; -, not detected by PCR.

^cn.a., not applicable; n.d., not determined.