Table 1. Epidemiological, and genotypic characteristic of E. coli O157:H7 strains.

Strain	Host	Location	Origin	Isolation year	Stx1	Stx2	Stx2 subtype	Clade as in [28] (nts SNP 539, 1060, 438, 630) 2	Clade x 32 3	Stx2 integration loci
EDL933	Human,	patient	USA		+	+	stx2a	3 (C-G-C-T)	clade 3	wrbA
146N	Bovine	abattoir	ARG		+	+	stx2c	3(C-G-C-T)	ND	yehV
438/99	Bovine	abattoir	ARG	1999	-	+	stx2c	3(C-G-C-T)	ND	ND*
7.1 Anguil	Bovine	farm 1	ARG	2009	-	+	stx2a-stx2c	none (C-T-C-T)	clade 6
9.1 Anguil	Bovine	farm 1	ARG	2009	-	+	stx2a-stx2c	none(A-T-C-T)	clade 8	yehV
Vac 07–1	Bovine	farm 1	ARG	2007	-	+	stx2a-stx2c	none-(A-G-C-T)	clade 8
125/99	Human	patient	ARG		-	+	stx2a	none- (A-G-C-T)	clade 8	yehV
Rafaela II- 827	Bovine	farm 1	ARG	2009	-	+	stx2a-stx2c	none-(A-G-C-T)	clade 8	ND*
Balcarce 14.2	Bovine	farm 1	ARG	2009	-	+	stx2a-stx2c	none- (A-G-C-T)	clade 6	yehV
Balcarce 24.2	Bovine	farm 1	ARG	2009	-	+	stx2a-stx2c	none- (A-G-C-T)	clade 8
Neuquén 7562	Human	patient	ARG	2003	-	+	stx2c	none-(A-G-C-T)	clade 8	yehV

1 For geographical location of farms see Fig 1

2 nucleotide substitution in the four SNPs descrbed in [28]

3. clades as determined using the 32 SNP method described here