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Identification of Enterobacteriaceae by matrix-assisted laser desorption/ionization time-of-flight mass spectrometry using the VITEK MS system

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Abstract

This multicenter study evaluated the accuracy of matrix-assisted laser desorption/ionization time-of-flight (MALDI-TOF) mass spectrometry identifications from the VITEK MS system (bioMérieux, Marcy l’Etoile, France) for Enterobacteriaceae typically encountered in the clinical laboratory. Enterobacteriaceae isolates (n = 965) representing 17 genera and 40 species were analyzed on the VITEK MS system (database v2.0), in accordance with the manufacturer’s instructions. Colony growth (≤72 h) was applied directly to the target slide. Matrix solution (α-cyano-4-hydroxycinnamic acid) was added and allowed to dry before mass spectrometry analysis. On the basis of the confidence level, the VITEK MS system provided a species, genus only, or no identification for each isolate. The accuracy of the mass spectrometric identification was compared to 16S rRNA gene sequencing performed at MIDI Labs (Newark, DE). Supplemental phenotypic testing was performed at bioMérieux when necessary. The VITEK MS result agreed with the reference method identification for 96.7 % of the 965 isolates tested, with 83.8 % correct to the species level and 12.8 % limited to a genus-level identification. There was no identification for 1.7 % of the isolates. The VITEK MS system misidentified 7 isolates (0.7 %) as different genera. Three Pantoea agglomerans isolates were misidentified as Enterobacter spp. and single isolates of Enterobacter cancerogenus, Escherichia hermannii, Hafnia alvei, and Raoultella ornithinolytica were misidentified as Klebsiella oxytoca, Citrobacter koseri, Obesumbacterium proteus, and Enterobacter aerogenes, respectively. Eight isolates (0.8 %) were misidentified as a different species in the correct genus. The VITEK MS system provides reliable mass spectrometric identifications for Enterobacteriaceae.

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Acknowledgments

Financial support for this project was provided by bioMérieux.

Conflict of interest

S.S. Richter has received a speaker honorarium from bioMérieux and research funding from bioMérieux, Nanosphere, Pocared, and Forest Laboratories. J.A. Branda, J.A. Rychert, and M.J. Ferraro have received research funding from bioMérieux and Becton Dickinson and Co. C.-A.D. Burnham has received research funding from bioMérieux, Accler8, Cepheid, and T2 Biosystems. C.C. Ginocchio has received research funding and consulting fees from bioMérieux and Becton Dickinson. M.A. Lewinski has received research funding from bioMérieux. G.W. Procop has received research funding from bioMérieux, Bruker, CDC, Pocared, and Luminex. All other authors declare that they have no conflict of interest.

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Authors and Affiliations

  1. Department of Clinical Pathology, Cleveland Clinic, 9500 Euclid Avenue/LL1-2, Cleveland, OH, 44195, USA

    S. S. Richter

  2. Department of Clinical Pathology, Cleveland Clinic, 9500 Euclid Avenue/L40, Cleveland, OH, 44195, USA

    L. Sercia & G. W. Procop

  3. Department of Pathology, Massachusetts General Hospital and Harvard Medical School, Boston, MA, USA

    J. A. Branda, M. J. Ferraro & J. A. Rychert

  4. Department of Pathology and Immunology, Washington University School of Medicine, St. Louis, MO, USA

    C.-A. D. Burnham & L. F. Westblade

  5. Barnes Jewish Hospital, St. Louis, MO, USA

    R. Jennemann

  6. Department of Pathology and Laboratory Medicine, North Shore-LIJ Health System Laboratories, Lake Success, NY, USA

    M. Bythrow, C. C. Ginocchio & R. Manji

  7. Department of Pathology and Laboratory Medicine, David Geffen School of Medicine at UCLA, Los Angeles, CA, USA

    O. B. Garner, M. A. Lewinski & A. B. Mochon

  8. Department of Pathology and Laboratory Medicine, Hofstra North Shore-LIJ School of Medicine, Hempstead, NY, USA

    C. C. Ginocchio & L. F. Westblade

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  1. S. S. Richter
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  2. L. Sercia
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  3. J. A. Branda
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  5. M. Bythrow
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  6. M. J. Ferraro
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  7. O. B. Garner
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  9. R. Jennemann
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  10. M. A. Lewinski
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  11. R. Manji
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  13. J. A. Rychert
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  14. L. F. Westblade
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  15. G. W. Procop
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Correspondence to S. S. Richter.

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Richter, S.S., Sercia, L., Branda, J.A. et al. Identification of Enterobacteriaceae by matrix-assisted laser desorption/ionization time-of-flight mass spectrometry using the VITEK MS system. Eur J Clin Microbiol Infect Dis 32, 1571–1578 (2013). https://doi.org/10.1007/s10096-013-1912-y

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  • DOI: https://doi.org/10.1007/s10096-013-1912-y

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