Table 1.

Minimum inhibitory concentrations for E. coli containing empty vector control, wild-type, and mutant enzymes

Plasmid	MIC (μg/ml)
	CTXa	CAZ
pTP123	<0.05	0.19
CTX-M-14	4.0	0.38
N106S	0.25	0.38
D240G	1.5	0.5
N106S/D240G	6.0	0.75

^a CTX is cefotaxime; CAZ is ceftazidime.