TABLE 1.

MICs of different antibiotics against clinical isolates of A. baumannii

Isolate	MIC (μg/ml)a
	Ampicillin	Ceftazidime	Levofloxacin	Minocycline	Polymyxin B
1775	2	12	0.125	0.125	0.064
1776	2	12	0.125	0.125	0.5
1777	2	8	0.125	0.125	4
1788	16	64	>32	8	0.75
1789	12	48	>32	12	1
1790	16	96	8	4	0.5
1791	24	128	8	1.5	0.75
1792	64	64	8	2	0.75
1793	32	64	12	2	0.5
1794	32	96	6	1.5	0.64
1795	14	96	4	1.5	0.125
1796	128	96	4	2	0.125
1797	256	128	4	2	0.38

^aThe antibiotic class, target, dose range tested, and susceptibility breakpoints for the tested drugs were as follows: ampicillin, β-lactam, cell wall, 0.016 to 256 μg/ml, susceptibility at ≤8 μg/ml and resistance at ≥32 μg/ml; ceftazidime, β-lactam, cell wall, 0.016 to 256 μg/ml, susceptibility at ≤16 μg/ml and resistance at ≥64 μg/ml; levofloxacin, fluoroquinolone, topoisomerases, 0.002 to 32 μg/ml, susceptibility at ≤2 μg/ml and resistance at ≥8 μg/ml; minocycline, tetracycline, protein synthesis, 0.016 to 256 μg/ml, susceptibility at ≤4 μg/ml and resistance at ≥16 μg/ml; polymyxin B, polypeptide, outer membrane, 0.064 to 1,024 μg/ml, susceptibility at ≤2 μg/ml and resistance at ≥8 μg/ml. Bold numbers indicate resistance.