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Global spread of carbapenem-resistant Acinetobacter baumannii

Global spread of carbapenem-resistant Acinetobacter baumannii ObjectivesWe have investigated the molecular epidemiology and distribution of carbapenemase genes in 492 imipenem-non-susceptible Acinetobacter baumannii worldwide isolates (North and Latin America, Europe, Asia, South Africa and Australia).MethodsMICs were determined by broth microdilution and Etest. The presence of carbapenemase-encoding genes was investigated by PCR. Molecular epidemiology was performed by repetitive sequence-based PCR (rep-PCR; DiversiLab), sequence-type multiplex PCR and PFGE.ResultsImipenem non-susceptibility was associated with ISAba1 upstream of the intrinsic blaOXA-51-like or the acquired carbapenemase blaOXA-23-like, blaOXA-40-like or blaOXA-58-like. Isolates were grouped into eight distinct clusters including European clones I, II and III. European clone II was the largest (246 isolates) and most widespread group (USA, pan-Europe, Israel, Asia, Australia and South Africa).ConclusionsThe global dissemination of eight carbapenem-resistant lineages illustrates the success this organism has had in epidemic spread. The acquired OXA enzymes are widely distributed but are not the sole carbapenem resistance determinant in A. baumannii. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Antimicrobial Chemotherapy Oxford University Press

Global spread of carbapenem-resistant Acinetobacter baumannii

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References (33)

Publisher
Oxford University Press
Copyright
© Published by Oxford University Press.
Subject
Original research
ISSN
0305-7453
eISSN
1460-2091
DOI
10.1093/jac/dkp428
pmid
19996144
Publisher site
See Article on Publisher Site

Abstract

ObjectivesWe have investigated the molecular epidemiology and distribution of carbapenemase genes in 492 imipenem-non-susceptible Acinetobacter baumannii worldwide isolates (North and Latin America, Europe, Asia, South Africa and Australia).MethodsMICs were determined by broth microdilution and Etest. The presence of carbapenemase-encoding genes was investigated by PCR. Molecular epidemiology was performed by repetitive sequence-based PCR (rep-PCR; DiversiLab), sequence-type multiplex PCR and PFGE.ResultsImipenem non-susceptibility was associated with ISAba1 upstream of the intrinsic blaOXA-51-like or the acquired carbapenemase blaOXA-23-like, blaOXA-40-like or blaOXA-58-like. Isolates were grouped into eight distinct clusters including European clones I, II and III. European clone II was the largest (246 isolates) and most widespread group (USA, pan-Europe, Israel, Asia, Australia and South Africa).ConclusionsThe global dissemination of eight carbapenem-resistant lineages illustrates the success this organism has had in epidemic spread. The acquired OXA enzymes are widely distributed but are not the sole carbapenem resistance determinant in A. baumannii.

Journal

Journal of Antimicrobial ChemotherapyOxford University Press

Published: Feb 8, 2010

Keywords: oxacillinases epidemiology rep-PCR tigecycline IS Aba1

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