TABLE 1.

MICs of β-lactams for clinical isolates M. morganii 1 and 5, E. coli DH10B harboring recombinant plasmid pPON-1, and the E. coli DH10B reference strain

β-Lactam	MIC (μg/ml)
	M. morganii 1	E. coli DH10B (pPON-1)	E. coli DH10B	M. morganii 5
Amoxicillin	>512	>512	2	512
Amoxicillin + Claa	512	>512	2	512
Amoxicillin + Tazb	32	32	2	32
Ticarcillin	8	64	2	0.12
Ticarcillin + Cla	8	64	1	0.25
Ticarcillin + Taz	2	32	1	0.25
Piperacillin	32	32	1	0.5
Cephalothin	>512	>512	4	>512
Cefamandole	64	32	1	>512
Cefoxitin	16	128	8	16
Cefepime	0.06	0.06	0.03	<0.06
Cefpirome	0.5	0.06	0.03	1
Ceftazidime	4	16	0.12	<0.06
Ceftazidime + Clav	4	32	0.12	<0.06
Ceftazidime + Taz	0.06	2	0.12	<0.06
Cefotaxime	4	4	0.12	0.12
Ceftriaxone	2	1	0.06	<0.06
Imipenem	1	0.12	0.06	1
Aztreonam	1	1	0.12	<0.06
Moxalactam	0.125	0.5	0.25	<0.06

^aCla, clavulanic acid at a fixed concentration of 2 μg/ml. 

^bTaz, tazobactam at a fixed concentration of 4 μg/ml.