TABLE 1.

Results of in vitro susceptibility testing of 150 A. baumannii group clinical isolates

Isolatea	n	Tigecyclineb			Minocycline
		MIC (μg/ml)c			MIC (μg/ml)c			% Susceptible
		Range	50%	90%	Range	50%	90%
PDR	46	0.5-8	1	2	0.25-16	8	16	8.7
XDR	40	0.25-4	1	2	0.25-32	8	16	30
IPM-S	64	0.03-2	1	2	≤0.06-16	4	8	60.9
Total	150	0.03-8	1	2	≤0.06-32	8	16	36.6

^aThe isolates were classified according to the susceptibility to the antimicrobials listed in the text (excluding tigecycline and minocycline) as follows: PDR, resistant to all antibiotics including colistin; extensively drug resistant (XDR), only susceptible to colistin; and (for the rest of the isolates), imipenem susceptible (IPM-S), displaying variable susceptibility to the remaining agents.

^bNo susceptibility breakpoint for Acinetobacter has been provided by CLSI.

^c50% and 90%, MIC₅₀ and MIC₉₀, respectively.