A plasmid-borne blaOXA-58 gene confers imipenem resistance to Acinetobacter baumannii isolates from a Lebanese hospital.

Antimicrobial Agents and Chemotherapy
Raffaele ZarrilliMaria Triassi

Abstract

We investigated the basis of the carbapenem resistance of 17 multidrug-resistant Acinetobacter baumannii clinical isolates collected from 2004 to 2005 at the Saint George University Hospital in Beirut, Lebanon. A. baumannii isolates were clonally related and were susceptible to colistin and trimethoprim-sulfamethoxazole, susceptible or intermediate to ampicillin-sulbactam and meropenem, and resistant to all other antimicrobials. Conjugation experiments demonstrated that resistance to imipenem could be transferred along with a plasmid containing the carbapenem-hydrolyzing oxacillinase bla(OXA-58) gene. The plasmid that we called pABIR was 29,823 bp in size and showed a novel mosaic structure composed of two origins of replication, four insertion sequence (IS) elements, and 28 open reading frames. The bla(OXA-58) gene was flanked by IS18 and ISAba3 elements at the 5' and 3' ends, respectively. The production of the carbapenem-hydrolyzing oxacillinase OXA-58 was apparently the only mechanism for carbapenem resistance in A. baumannii isolates causing the outbreak at the Lebanese Hospital.

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Citations

Jun 3, 2009·Antimicrobial Agents and Chemotherapy·Marco Maria D'AndreaGian Maria Rossolini
May 9, 2012·Antimicrobial Agents and Chemotherapy·Simon RoseStephen Douthwaite
Jun 29, 2011·Antimicrobial Agents and Chemotherapy·Benoit DesmolaizeStephen Douthwaite
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