RRML - Phenotypic Carbapenemase Production and blaOXA detecting by PCR in Acinetobacter baumannii

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Dr. Adrian Man

Nr. 30(4)/2022 DOI:10.2478/rrlm-2022-0033

Research article

Phenotypic Carbapenemase Production and blaOXA detecting by PCR in Acinetobacter baumannii

Elena-Roxana Buzilă, Olivia Simona Dorneanu, Cătălina Luncă, Igor Jelihovschi, Luminiţa Smaranda Iancu

Correspondence should be addressed to: Cătălina Luncă


Introduction: In the last 40 years, Acinetobacter baumannii has been among the bacteria known to acquire multiple mechanisms of antibiotic resistance and, as a result, it is now one of the pathogens involved in healthcare-associated infections with multidrug resistant strains. Our study aimed to assess the production of carbapenemases in carbapenem-resistant A. baumannii by means of phenotypic methods and polymerase chain reaction technique (PCR), as well as to appraise the performances of carbapenemase detection by phenotypic tests compared to the PCR approach. Materials and Methods: We used phenotypic methods (E-test MBL, CIM, MHT, Rosco® Kit/OXA/MBL, OXA-23 K-SeT® assay) to investigate the production of carbapenemases in 43 carbapenem-resistant A. baumannii isolates, and PCR to screen for the genes blaOXA-23, blaOXA-24, blaOXA-58, blaOXA-51, blaVIM, blaIMP and blaNDM. Results: The carbapenem inactivation method (CIM) at 2 hours, CIM at 4h, OXA-23 K-SeT® assay, Rosco® Kit/OXA, and modified Hodge test (MHT) identified 26%, 63%, 65%, 81%, and 42% carbapenemase-producing isolates, respectively. The phenotypic E-test MBL detected metallo-β-lactamase (MBL) production in 79% of strains. PCR revealed blaOXA-51 in all the isolates, blaOXA-23 in 35/43 (81%), blaOXA-24 in 28/43 (65%), blaVIM in 7/43 (3%) and blaOXA-58, blaIMP, blaNDM were not detected. Conclusion: Because phenotypic tests do not highlight all the carbapenemase-producing strains, their results must be interpreted with caution relative to their level of performance, and negative results should be confirmed by means of PCR.

Keywords: Acinetobacter baumannii, genotyping, carbapenemase production, OXA-23, OXA-24

Received: 19.4.2022
Accepted: 12.7.2022
Published: 21.8.2022

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How to cite
Buzilă ER, Dorneanu OS, Luncă C, Jelihovschi I, Iancu LS. Phenotypic Carbapenemase Production and blaOXA detecting by PCR in Acinetobacter baumannii. Rev Romana Med Lab. 2022;30(4):453-65. DOI:10.2478/rrlm-2022-0033