Table 4.
Discrepancies and error in the conventional identification method (Vitek 2) and MALDI-TOF for the identification of 16 Gram-positive bacilli
| 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) |
No ID = no identification spite of its presence in database; Mis - ID = misidentification; NA = not present in database.