OBJECTIVE To investigate the presence and change of quinolone resistance genes in multidrug-resistant Acinetobacter baumannii(A.baumannii)so as to provide guidance for the reasonable use of antibiotics.METHODS A total of 20 strains of multidrug-resistant A.baumannii,which were isolated from the sputum specimens obtained from the patients who were hospitalized from Jan to Dec 2012,were enrolled in the study,then the polymerase chain reaction(PCR)and DNA sequencing were employed to analyze the quinolone targe...