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1 Hacettepe University, Children's Hospital, Ankara, Turkey
2 Marmara University Hospital, Istanbul, Turkey
3 Hacettepe University, School of Medicine, Infectious Disease Unit, Ankara, Turkey
4 JMI Laboratories, North Liberty, IA 52317, USA
Correspondence
Mariana Castanheira
mariana-castanheira{at}jmilabs.com
Received April 4, 2008
Accepted August 20, 2008
A significant increase in carbapenem-resistance rates among Acinetobacter baumannii isolates collected in two Turkish medical centres was detected in the 2000–2006 period (20–60 %) by the SENTRY Antimicrobial Surveillance Program. Carbapenem-resistant strains from 2006 were evaluated for the presence of encoding genes and epidemic clonality. OXA-58-like and OXA-23-like carbapenemase-producing strains were detected in both medical institutions. Seventeen out of 18 strains from Ankara were positive for blaOXA-58 primers and belonged to the same clone, whilst 26 isolates (25 from Istanbul and one from Ankara) harboured blaOXA-23-like genes and showed identical or similar PFGE patterns. Isolates producing OXA-23-like carbapenemases were more resistant than OXA-58-like carbapenemase producers to non-carbapenem antimicrobial agents. Carbapenem resistance in these institutions was observed to be largely driven by the dissemination of clones producing OXA-type carbapenemases.
Abbreviations: FDA, Food and Drug Administration; MβL, metallo-β-lactamase.
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