OBJECTIVE To investigate the presence and genetic background of aminoglycoside modifying enzyme (AME) genes and 16S rRNA methylase genes in multi-drug resistant Acinetobacter baumannii (MDR-ABA),which was isolated from the First Affiliated Hospital,College of Medicine,Zhejiang University. METHODS Sixty-two strains of MDR-ABA were isolated from the inpatients between Nov 2007 and Feb 2008,15 kinds of aminoglycoside modifying enzyme genes and 6 kinds of 16S rRNA methylase genes were analyzed by PCR and verifi...