TABLE 1.

E. coli strains used as controls in this study^a

Strain	Serotype	DA	Relevant genetic markers	Fermentation of sorbitol	Reference
EDL933	O157:H7	HC	stx1, stx2, eae	−	26
702/88	O157:H−	HUS	stx2, eae	+	1
1533/97	O157:H−	HUS	stx2, eae	+	SC
3817/96	O157:H−	HUS	stx1, stx2c	−	7
E32511	O157:H−	HUS	stx2, stx2c, eae	−	35
693/91	O157:H19	WD	stx−, eae−	+	3
241/88	O157:H43	WD	stx−, eae−	+	1
1083/87	O157:H45	WD	stx−; eae,b EAF+	+	31
904/90	O157:H45	WD	stx−; eae,b EAF−	+	1

^aAbbreviations: SC, strain collection (isolation during routine diagnostic work in 1997); HC, hemorrhagic colitis; DA, disease association; WD, watery diarrhea; stx⁻ and eae⁻, negative for stx and eae, respectively; EAF⁺, positive for EAF plasmid; EAF⁻, negative for EAF plasmid. 

^bEnteropathogenic E. coli eae.