TABLE 2.

MICs of β-lactams for A. baumannii RYC 52763/97 and recipient strain E. coli TG1 harboring various β-lactamases

β-Lactam	MIC (μg/ml) for strain (enzyme[s])a
	A. baumannii RYC 52763/97 (AmpC, OXA-24 enzyme, and TEM-1)	E. coli TG1	E. coli TG1 with pGER1 (AmpC)b	E. coli TG1 (TEM-1)	E. coli TG1 with pBMB-1 (OXA-24)
Ampicillin	>1,024	4	128	>1,024	128
Ampicillin + clavulanic acidc	512	4	64	16	64
Ticarcillin	>1,024	4	32	>1,024	256
Cefazolin	>256	8	>256	16	32
Cefuroxime	>256	4	>256	4	4
Cefoxitin	>256	4	4	4	4
Cefotaxime	>256	0.06	4	0.06	0.06
Ceftazidime	>256	0.125	16	0.125	0.25
Cefepime	256	0.06	0.25	0.06	0.125
Aztreonam	>256	0.06	1	0.06	0.125
Imipenem	128	0.125	0.125	0.125	1
Meropenem	256	0.03	0.03	0.03	0.125

^aAll the β-lactamase genes were cloned into the same pBGS18⁻ plasmid. 

^bSee reference 7. 

^cConcentration of the inhibitor was 4 μg/ml.