Table A7.

Phenotypic resistance of Escherichia coli strains. MIC = minimum inhibitory concentration. ESBL = signal in phenotypic testing for extended-spectrum beta-lactamases.

Sample ID	ESBL	Ampicillin		Ampicillin/Sulbactam		Piperacillin/Tazobactam		Cefuroxime		Cefuroxime Axetil		Cefpodoxime		Cefotaxime		Ceftrazidime
		MIC	Interpretation	MIC	Interpretation	MIC	Interpretation	MIC	Interpretation	MIC	Interpretation	MIC	Interpretation	MIC	Interpretation	MIC	Interpretation
41	positive	≥32	R	≥32	R	64	R	≥64	R	≥64	R	≥8	R	≥64	R	16	R
49	negative	≥32	R	16	R	≤4	S	4	I	4	S	≤0.25	S	≤1	S	≤1	S
68	negative	≥32	R	16	R	≤4	S	≤1	I	≤1	S	≤0.25	S	≤1	S	≤1	S
117	negative	≥32	R	≥32	R	64	R	4	I	4	S	≤0.25	S	≤1	S	≤1	S
152	negative	≥32	R	≥32	R	≥128	R	4	I	4	S	0.5	S	≤1	S	≤1	S
176	negative	≥32	R	≥32	R	≤4	I	2	I	2	S	≤0.25	S	≤1	S	≤1	S
221	negative	≥32	R	≥32	R	≤4	I	2	I	2	S	≤0.25	S	≤1	S	≤1	S
222	negative	≥32	R	≥32	R	≤4	I	4	I	4	S	≤0.25	S	≤1	S	≤1	S
225	positive	≥32	R	≥32	R	≤4	R	≥64	R	≥64	R	≥8	R	≥64	R	16	R
245	positive	≥32	R	≥32	R	16	I	16	R	16	R	1	S	2	I	≤1	S
270	positive	≥32	R	16	R	≤4	R	≥64	R	≥64	R	≥8	R	≥64	R	≥64	R
299	negative	≥32	R	≤2	I	≤4	S	4	I	4	S	≤0.25	S	≤1	S	≤1	S