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Table 4 Discrepancies and error in the conventional identification method (Vitek 2) and MALDI-TOF for the identification of 16 Gram-positive bacilli

From: Real-time comparative evaluation of bioMerieux VITEK MS versus Bruker Microflex MS, two matrix-assisted laser desorption-ionization time-of-flight mass spectrometry systems, for identification of clinically significant bacteria

Final identification (no of isolates) Number of isolates
Conventional identification method (Vitek 2) VITEK MS identification Bruker MS identification 16S rRNA sequence results (number of discrepant organisms sequenced)
No ID Mis - ID No ID Mis - ID No ID Mis - ID  
Corynebacterium terpenotabidum (1) NA NA 0 1 (Clostridium septicum) 0 1 (Clostridium beijerinckii) C. terpenotabidum (1)
Lactobacillus jensenii (3) NA NA 0 0 0 0 L. jensenii (3)
Corynebacterium striatum (5) NA NA 0 0 0 0 C. striatum (5)
Lactobacillus rhamnosus (2) NA NA 0 0 0 0 L. rhamnosus (2)
Erysipelothrix rhusiopathiae (1) 0 0 0 0 0 0  
Listeria monocytogenes (1) 0 0 0 0 0 0  
Listeria ivanovi (2) 0 0 0 0 0 1 (L. monocytogenes) L. ivanovii (1)
Nocardia otitidiscaviarum (1) 0 1 (L. monocytogenes) 0 1 (L. monocytogenes) 0 1 (L. monocytogenes) N. otitidiscaviarum (1)
  1. No ID = no identification spite of its presence in database; Mis - ID = misidentification; NA = not present in database.