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“Background Acinetobacter baumannii has emerged as a major cause of nosocomial infections, especially in intensive care units [1]. Both its ability to acquire resistant determinants and to adapt to harsh environments has made A. baumannii a successful pathogen [2]. A. baumannii has high rates of resistance to many available antibiotics in clinical practice. For example, imipenem-resistant A. baumannii constituted > 50% of a worldwide collection of clinical samples between 2005 and 2009 [3].