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Antimicrob Agents Chemother. 2009 Jun;53(6):2657-9. doi: 10.1128/AAC.01663-08. Epub 2009 Mar 23.

In vivo selection of reduced susceptibility to carbapenems in Acinetobacter baumannii related to ISAba1-mediated overexpression of the natural bla(OXA-66) oxacillinase gene.

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1
Service de Bactériologie-Virologie, INSERM U914 Emerging Resistance to Antibiotics, Hôpital de Bicêtre, 78 Rue du Général Leclerc, 94275 Le Kremlin-Bicêtre Cedex, France.

Abstract

Two clonally related Acinetobacter baumannii isolates, A1 and A2, were obtained from the same patient. Isolate A2, selected after an imipenem-containing treatment, showed reduced susceptibility to carbapenems. This resistance pattern was related to insertion of the ISAba1 element upstream of the naturally occurring bla(OXA-66) carbapenemase gene as demonstrated by sequencing, reverse transcription-PCR analysis, and inactivation of the bla(OXA-66) gene.

PMID:
19307373
PMCID:
PMC2687192
DOI:
10.1128/AAC.01663-08
[Indexed for MEDLINE]
Free PMC Article
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