TABLE 1.

Susceptibilities of 43 clinical isolates of E. coli O157 and 56 clinical isolates of non-O157 E. coli to antimicrobial agents^a

Antimicrobial agent	MIC (μg/ml)
	Range (μg/ml)	50%	90%
Ampicillin	2 to >128	2	4
Arbekacin	0.5 to 1	1	1
Cefaclor	2 to 4	2	2
Cefdinir	≤0.13 to 0.5	0.25	0.25
Cefditoren	≤0.13 to 0.5	0.25	0.25
Cefmetazole	0.25 to 1	0.50	0.50
Cefotetiam	≤0.13	≤0.13	≤0.13
Cefpodoxime	0.25 to 0.5	0.50	0.50
Ceftazidime	≤0.13 to 0.25	≤0.13	≤0.13
Cefteram	≤0.13 to 0.25	0.25	0.25
Ciprofloxacin	≤0.13	≤0.13	≤0.13
Clavulanic acid-amoxicillin	4 to 8	4	4
Dibekacin	1 to 2	1	1
Flomoxef	≤0.13	≤0.13	≤0.13
Levofloxacin	≤0.13	≤0.13	≤0.13
Minocycline	1 to 16	1	2
Ofloxacin	≤0.13	≤0.13	≤0.13
Piperacillin	0.50 to 8	1	1
Sulbactam-cefoperazone	≤0.13 to 0.25	≤0.13	≤0.13
Tosufloxacin	≤0.13	≤0.13	≤0.13
Vancomycin	64 to >128	128	128
Fosfomycin
O157	16 to 32	16	32
Non-O157	2 to 128	16	128
Fosfomycin-G6Pb
O157	≤0.13 to 0.5	0.5	0.5
Non-O157	1 to 64	4	16
Kanamycin
O157	2 to 4	2	4
Non-O157	2 to 64	4	32
Norfloxacin
O157	≤0.13	≤0.13	≤0.13
Non-O157	≤0.13 to 2	≤0.13	≤0.13

^aThe data are for O157 unless indicated otherwise. 50% and 90%, concentrations of antimicrobial agents which inhibited growth in 50 and 90% of the strains, respectively. 

^b3 μg of G6P per ml.