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“Background Acinetobacter baumannii is a Gram-negative coccobacillus frequently associated with nosocomial infections worldwide [1, 2]. It is an opportunistic pathogen with a wide spectrum of clinical manifestations, including pneumonia, meningitis, and blood stream, urinary tract, and wound infections [3, 4]. A. baumannii has developed resistance to broad-spectrum antibiotics and has thus become problematic in intensive care units (ICUs) [5]. In Taiwan, the first multidrug-resistant A. baumannii (MDRAB) strain was identified in 1998 [6].