Incidence of OXA-23 and OXA-58 Carbapenemases Coexpressed in Clinical Isolates of Acinetobacter baumannii in Tunisia - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Microbial Drug Resistance Année : 2018

Incidence of OXA-23 and OXA-58 Carbapenemases Coexpressed in Clinical Isolates of Acinetobacter baumannii in Tunisia

Najla Mathlouthi
  • Fonction : Auteur
Yomna Ben Lamine
  • Fonction : Auteur
Rania Somai
  • Fonction : Auteur
Sophia Bouhalila-Besbes
  • Fonction : Auteur
Sofiane Bakour
  • Fonction : Auteur
Chedly Chouchani

Résumé

Acinetobacter baumannii is an important opportunistic and multidrug-resistant pathogen responsible for nosocomial infections in health facilities. The aim of this study was to characterize the molecular mechanisms of carbapenem resistance in A. baumannii isolates isolated from Mohamed Kassab Orthopedic Institute in Tunis, Tunisia. Twenty-five imipenem-resistant A. baumannii clinical isolates collected between 2013 and 2016 were identified using API 20NE and were confirmed by matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF/MS). Carbapenemase activity was detected using microbiological tests and PCR. The epidemiological relatedness of the isolates was studied using multilocus sequence typing (MLST). The isolates were resistant to all antibiotics tested with increased minimum inhibitory concentration values (>32mg/L). The microbiological tests showed that the 25 A. baumannii were positive for modified Hodge test and for the Carba NP test; however, -lactamase activity was not inhibited by EDTA. All the isolates harbored the naturally occurring bla(OXA-51)-like gene and the bla(OXA-23)-like carbapenemase gene. Among these isolates, one isolate coexpressed the bla(OXA-58) gene. MLST revealed several sequence types (STs) with the predominance of ST2 imipenem-resistant A. baumannii (14/25; 56%). In this study we report the prevalence of ST2 imipenem resistance and for the first time the coexpression of bla(OXA-23) and bla(OXA-58) in clinical isolates of A. baumannii in a Tunisian hospital.
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Dates et versions

hal-01780652 , version 1 (27-04-2018)

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Citer

Najla Mathlouthi, Yomna Ben Lamine, Rania Somai, Sophia Bouhalila-Besbes, Sofiane Bakour, et al.. Incidence of OXA-23 and OXA-58 Carbapenemases Coexpressed in Clinical Isolates of Acinetobacter baumannii in Tunisia. Microbial Drug Resistance, 2018, 24 (2), pp.136-141. ⟨10.1089/mdr.2016.0306⟩. ⟨hal-01780652⟩

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