Table 1. Bacterial strains used.

Type of Bacteria & Strain Name	Serotype, if relevant	Antibiotic MIC by E-test, μg/mL		Comments	References
		Ciprofloxacin, on DMEM	Rifampin, on LB
STEC
EDL933	O157:H7	0.023	4	Stx1, Stx2-producer	[16]
EDL933R	O157:H7	0.003	2	ΔrecA mutant of EDL933; hypersusceptible to antibiotics	[17]
Popeye-1, TW14359	O157:H7	0.016	6	Stx2, Stx2c-producer; 2006 U.S. Spinach outbreak	[18]
TSA14	O26:H11	0.008	—	Stx1-producer	[19]
EPEC
B171-8	O111:NM	0.012	4	classic human EPEC strain; Mexico	[20, 21]
ExPEc
CP9		0.008	4	bacteremic isolate, NIH	[22]
Laboratory and Reporter Strains
JLM281		0.012	10	recA-lacZ reporter strains	[23, 24]
Klebsiella pneumoniae
Kpneu_707	not done	0.125	16	clinical isolate; bacteremic pneumonia isolate from a 73 year old man.	Erie County Medical Center Clinical Microbiology lab, July, 2007