TABLE 2.

MIC range and MIC₅₀ in carbapenemase-producing Klebsiella pneumoniae

Drug	MIC range (MIC50) (mg/liter)
	IMP-1 producers	IMP-6 producers
Meropenem	0.25 to 64 (1)	0.25 to 16 (1)
Imipenem	0.125 to 64 (1)	≤0.06 to 0.5 (0.125)
Piperacillin	4 to 256 (128)	8 to >256 (>256)
Tazobactam/piperacillin	2 to 256 (64)	0.5 to 32 (8)
Cefotaxime	16 to 128 (64)	8 to >256 (64)
Ceftazidime	128 to >256 (>256)	4 to >256 (32)
Cefmetazole	256 to >256 (>256)	8 to >256 (64)
Aztreonam	≤0.06 to 1 (0.25)	≤0.06 to 128 (8)
Levofloxacin	≤0.06 to 32 (16)	≤0.06 to 128 (16)
Gentamicin	0.25 to 4 (1)	0.5 to 32 (2)
Amikacin	0.25 to 2 (1)	0.5 to 8 (2)