TABLE 1.

STEC O157 strains used in this study

Serotype	Strain(s)	Country of origin	Source or reference
NSF STEC O157:H7	EDL933	United States	44
	H77, H511, 1477/AI	Scotland	11, 42, 47
SF STEC O157:NM	H2687	Scotland	35
	H8824, H8432, H8489, H8757, H8478	Scotland	2006 Scottish outbreak cluster
	493/89, 2260/96, 3072/96, 340/97, 1527/97, 3873/98, 4368/98, 0355/99, 2696/99, DN940/00, 2518/00, 3317/00, 080/01, 164/01, 689/01, E02/16, E02/115, E02/129, E02/149, E02/172, E02/207, E02/456, E02/679, E02/774, E02/793, E02/809, E02/813, E02/817, E02/819, E02/829, E02/848, E02/852, E02/870, E02/878, E02/879, E03/1, E03/23, E03/49, E03/53, E03/55, E03/71, E03/86, E03/88, E03/100, E03/104, E03/106, E03/108, E03/198, E03/200, E04/1278, E05/15, E05/18, E05/22, E05/114, E06/443, E06/449, E06/481, E06/484, E06/486, E06/494, E06/537, E07/50, E07/59, E07/64, E07/65, E07/67	Germany	H. Karch, Muenster University, Germany