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Evaluation of the Bruker® MBT Sepsityper IVD module for the identification of polymicrobial blood cultures with MALDI-TOF MS

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Abstract

Matrix-assisted laser desorption ionization time-of-flight mass spectrometry (MALDI-TOF MS) considerably reduces timeframe required from initial blood culture positivity towards complete bacterial identification. However, rapid identification of polymicrobial blood cultures remains challenging. We evaluated the performances of the Bruker® MBT Sepsityper IVD module on MALDI-TOF MS for the direct identification of polymicrobial blood culture bottles. This module has the ability to give a strong indication that a sample contains a mixture of organisms and to identify two of them. Blood culture bottles considered as polymicrobial using routine subculture were collected and processed using the Sepsityper kit. MALDI-TOF MS identification was performed using the MBT Compass IVD software including the Sepsityper module. From 143 polymicrobial blood culture bottles tested, 34.3% (49/143) were completely identified by the module. Both microorganisms were more easily detected by the module in samples containing two pathogens than in samples containing two contaminants (36.8% vs 29.4%). Additionally, in more than half of the samples, the module detected 1 of the different microorganisms contained in the same vial. In these cases, with a pathogen and contaminant in the same sample, the module detected the pathogen in more than 80%. The Sepsityper module identified 14 microorganisms which were not recovered by conventional culture methods. The Bruker® MBT Sepsityper IVD module contributed to a valuable identification of polymicrobial blood cultures in more than a third of all cases. Conventional culture methods are still required to complete the results and to carry on susceptibility testing.

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Authors and Affiliations

  1. Department of Microbiology, Cliniques universitaires Saint-Luc, Université Catholique de Louvain, Avenue Hippocrate 10, B-1200, Brussels, Belgium

    Anaïs Scohy, Audrey Noël, Hector Rodriguez-Villalobos & Alexia Verroken

  2. Department of Microbiology, Clinique Saint-Joseph – CHC, Rue de Hesbaye 75, B-4000, Liège, Belgium

    Anca Boeras

  3. Department of Microbiology, Cliniques de l’Europe – Site Sainte-Elisabeth, Avenue de Fré 206, B-1160, Brussels, Belgium

    Laetitia Brassinne

  4. Department of Microbiology, Clinique et maternité Sainte-Elisabeth, Place Louise Godin 15, B-5000, Namur, Belgium

    Terry Laurent

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  1. Anaïs Scohy
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Testing was performed in accordance with the ethical standards of the Cliniques universitaires Saint-Luc, in accordance with the ethical standards of the national research committee, and in accordance with the 1964 Helsinki declaration and its later amendments.

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Information from microbiological and clinical files was anonymously analyzed and did not require patient’s informed consent.

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Scohy, A., Noël, A., Boeras, A. et al. Evaluation of the Bruker® MBT Sepsityper IVD module for the identification of polymicrobial blood cultures with MALDI-TOF MS. Eur J Clin Microbiol Infect Dis 37, 2145–2152 (2018). https://doi.org/10.1007/s10096-018-3351-2

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