Table 1.

Screening for carbapenem resistance among Acinetobacter isolates by disk diffusion and MIC determination methods

Susceptibility to carbapenems by disk diffusion		No of isolates	Imipenem MIC (µg/mL)
Carbapenem-susceptible (n=10)		5	0.5
		4	1
		1	2
Carbapenem-resistant (n=54)	Negative blaNDM-1 (n=12) (22.3%)	2	8
		3	16
		7	32
	Positive blaNDM-1 (n=42) (77.7%)	2	32
		8	64
		25	128
		5	256
		2	512

Abbreviations: MIC, minimum inhibitory concentration; blaNDM-1, New Delhi metallo-β-lactamase.