TABLE 2.

In vitro susceptibility of E. coli DH5α strains carrying the cloned bla_IMP-13 and bla_IMP-1 genes^a

β-Lactam	MIC (μg/ml) for E. coli strain
	DH5α(pLBII-IMP-13)	DH5α(pLBII-IMP-1)	DH5α(pBC-SK)
Ampicillin	8	32	0.5
Piperacillin	≤2	≤2	≤2
Cefoxitin	>32	>32	8
Cefotaxime	4	8	0.25
Ceftazidime	16	32	0.25
Imipenem	2	0.5	0.25
Meropenem	0.125	2	≤0.015
Ertapenem	0.125	2	≤0.015

^aThe MICs for the control strain carrying the empty vector are shown for comparison.