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  • Title: Comparison of Two Commercial Matrix-Assisted Laser Desorption/Ionization-Time of Flight Mass Spectrometry (MALDI-TOF MS) Systems for Identification of Nontuberculous Mycobacteria.
    Author: Brown-Elliott BA, Fritsche TR, Olson BJ, Vasireddy S, Vasireddy R, Iakhiaeva E, Alame D, Wallace RJ, Branda JA.
    Journal: Am J Clin Pathol; 2019 Sep 09; 152(4):527-536. PubMed ID: 31314059.
    Abstract:
    OBJECTIVES: This multicenter study's aim was to assess the performance of two commercially available matrix-assisted laser desorption/ionization time of flight mass spectrometry systems in identifying a challenge collection of clinically relevant nontuberculous mycobacteria (NTM). METHODS: NTM clinical isolates (n = 244) belonging to 23 species/subspecies were identified by gene sequencing and analyzed using Bruker Biotyper with Mycobacterial Library v5.0.0 and bioMérieux VITEK MS with v3.0 database. RESULTS: Using the Bruker or bioMérieux systems, 92% and 95% of NTM strains, respectively, were identified at least to the complex/group level; 62% and 57%, respectively, were identified to the highest taxonomic level. Differentiation between members of Mycobacterium abscessus, M fortuitum, M mucogenicum, M avium, and M terrae complexes/groups was problematic for both systems, as was identification of M chelonae for the Bruker system. CONCLUSIONS: Both systems identified most NTM isolates to the group/complex level, and many to the highest taxonomic level. Performance was comparable.
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