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J Antimicrob Chemother. 2018 Sep 1;73(9):2352-2359. doi: 10.1093/jac/dky209.

MALDI-TOF for the rapid detection of carbapenemase-producing Enterobacteriaceae: comparison of the commercialized MBT STAR®-Carba IVD Kit with two in-house MALDI-TOF techniques and the RAPIDEC® CARBA NP.

Author information

1
Department of Bacteriology-Hygiene, Hôpital de Bicêtre, Assistance Publique - Hôpitaux de Paris, Le Kremlin-Bicêtre, France.
2
Associated French National Reference Center for Antibiotic Resistance, Le Kremlin-Bicêtre, France.
3
Research Unit EA 7361 'Structure, dynamics, function and expression of broad spectrum β-lactamases', Faculty of Medicine, University Paris-Sud, Le Kremlin-Bicêtre, France.
4
Department of Microbiology, CHU de Brest, Brest, France.
5
Department of Microbiology, Hôpitaux Civils de Colmar, Colmar, France.

Abstract

Objectives:

There is an urgent need for accurate and fast diagnostic tests to identify carbapenemase-producing bacteria. Here, we have evaluated three MALDI-TOF-based techniques to detect carbapenemase-producing Enterobacteriaceae (CPE) from cultured colonies.

Methods:

The performance of three MALDI-TOF-based techniques, including the commercialized MBT STAR®-Carba IVD Kit (Bruker Daltonics) and two in-house protocols performed on the Microflex LT Biotyper (Bruker Daltonics) and the VITEK® MS Plus (bioMérieux), were compared with those of the RAPIDEC® CARBA NP (bioMérieux). A collection of 175 isolates including 120 carbapenemase producers and 55 non-carbapenemase producers was tested. Samples were tested blind in the three participating centres. The repeatability of the MBT STAR®-Carba IVD Kit was also evaluated.

Results:

The three MALDI-TOF techniques possess sensitivities ranging from 95% to 100% and specificities from 98.2% to 100% compared with 99.2% and 100%, respectively, for the RAPIDEC® CARBA NP. The MBT STAR®-Carba IVD Kit gave highly reproducible results and is the only technique able to provide a concomitant identification of the bacterial isolate. The three MALDI-TOF techniques possess a fast turnaround time (less than 1.5 h).

Conclusions:

Overall, MALDI-TOF is a reliable technique for the rapid detection of CPE from cultured colonies. MBT STAR®-Carba IVD Kit, the only commercially available assay, could easily be implemented in a clinical microbiology laboratory if it is already equipped with a Microflex LT Biotyper mass spectrometer.

PMID:
29897463
DOI:
10.1093/jac/dky209
[Indexed for MEDLINE]

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