Genes of Carbapenemases and Integrases in Multi-drug Resistant Acinetobacter baumannii / 中华医院感染学杂志

ABSTRACT

OBJECTIVE To investigate the genes of carbapenemases and integrases in multi-drug resistant Acinetobacter baumannii(MDRAba).METHODS PCR was used for detection of genes of carbapenemases OXA-23-like,OXA-24-like,OXA-51-like,and OXA-58-like,and integrases Ⅰand Ⅱ from 70 clinical strains of carbapenem-resistant A.baumannii(CRAba).PCR products of OXA-23-like and OXA-58-like were analyzed by sequencing.Agar dilution method was carried out for antimicrobial susceptibility test.RESULTS Genes for OXA-23-like and OXA-51-like were positive from 56 and 69 isolates,accounted for 80.0% and 98.6%, respectively;gene of OXA-58-like was detected from only one strain.Sixty one strains showed positive for integrase Ⅰ gene.OXA-23 or OXA-58 was the exact gene type by sequencing.All 70 strains were highly resistant to ciprofloxacin,ceftazidime,and gentamicin,but susceptible to polymyxin B.CONCLUSIONS CRAba strains distributed in General Hospital of PLA mainly possess OXA-23 type carbapenemase and integraseⅠ.