TABLE 1.

Forty-two E. coli O157:H7 strains used in this study

Accession no.a	Clade	Strain nameb	Lag phase extension (h)c	SD (h)d	Reference(s)
TW08264	1	Sakai	6.93	0.44	25, 37, 74, 80
TW08612	1	EK4	9.27	0.59	37, 74
TW10022	1	H2014	8.65	0.67	49
TW08616	2	EK8	7.91	0.52	37, 74
TW10012	2	F6854	9.20	0.64	49
TW04863	2	93-111	8.94	0.66	27, 33
TW10045	2	MLVA-47	9.59	0.66
TW11308	2		9.68	0.69
TW07961	2	DA-35	9.15	0.66
TW02302	3	EDL-933	8.89	0.63	18, 19, 27, 39, 50, 59
TW02300	3	CL-40	7.81	0.54	49
TW08613	3	EK5	7.30	0.54	37, 74
TW07957	3	DA-31	8.12	0.58	47
TW11346	3		9.38	0.65	49
TW11039	4		9.32	0.61	49
TW11116	5		8.34	0.54	49
TW14618	5		6.05	0.44	49
TW10248	5		8.57	0.65	49
TW09109	6		9.66	0.72	49
TW07941	6	DA-15	9.74	0.70
TW08080	6	MT-59	9.08	0.69	49
TW07520	6	1541	9.46	0.70	49
TW11102	6		10.61	0.46	49
TW09178	7		7.10	0.53	49
TW01663	7	87-1163	8.98	0.65	49
TW10245	7		8.32	0.51
TW11137	7		8.79	0.64	49
TW11516	7		7.08	0.54	49
TW14301	7		6.32	0.37	49
TW14359	8		6.64	0.54	49
TW11032	8		7.97	0.56	49
TW02883	8	E32511/O	7.63	0.57	11, 39
TW08030	8	MT-9	7.22	0.54	49
TW09098	8		8.43	0.66	49
TW14313	8		9.01	0.65	49
TW07945	8	DA-19	7.55	0.61
TW08609	8	EK1	7.36	0.60	37, 74
TW05356	9	G5101	10.29	0.42	19, 26, 83
TW11107	9		9.07	0.68	49
TW07763	9	2664/91	10.05	0.60	49
TW06591	9	CB1009	8.51	0.67	49
TW05353	9	5905	8.25	0.52	19

^aStrain accession numbers were provided by Thomas Whittam of Michigan State University.

^bAlternative strain names used in the references.

^cLag phase extension for each E. coli O157:H7 strain is provided as the mean value of at least five independent experiments under the chlorine treatment.

^dStandard deviation was calculated based on at least five replicates for each E. coli O157:H7 strain.