Research Article
Performances and Reliability of Bruker Microflex LT and VITEK MS MALDI-TOF Mass Spectrometry Systems for the Identification of Clinical Microorganisms
Table 5
Results summary of MALDI-TOF MS systems for the microorganisms that either were misidentified or could not be identified.
| | Microorganism groups | Number of isolates | Species content | Misidentification | No-identification | | VITEK | Bruker | VITEK | Bruker |
| | Nonfermentatives | | Acinetobacter baumannii | 194 | | — | — | 2 (F × 2) | 2 (F × 2) | | Aeromonas sobria | 1 | | — | — | — | 1 (F) | | Total | 356 | 16 | 2 | — | 2 | 3 |
| | Enterobacteriaceae | | Kluyvera cryocrescens | 1 | | — | — | 1 (G) | 1 (G) | | Shigella boydii | 1 | | 1 (N/A) | 1 (N/A) | — | — | | Total | 309 | 23 | 1 | 1 | 1 | 1 |
| | Staphylococci | | Staphylococcus epidermidis | 68 | | — | 2 (C × 2) | — | 1 (F) | | Total | 273 | 10 | — | 2 | — | 1 |
| | Streptococci | | Leuconostoc mesenteroides | 1 | | — | 1 (F) | 1 (F) | — | | Total | 29 | 11 | — | 1 | 1 | — |
| | Enterococci and other Gr(+) cocci | | Total | 160 | 5 | — | — | — | — |
| | Coryneforms and other Gr(+) bacilli | | Actinomyces naeslundii | 1 | | — | — | 1 (F) | — | | Corynebacterium coyleae | 1 | | 1 (D) | — | — | — | | Corynebacterium glaucum | 1 | | — | — | 1 (G) | 1 (G) | | Corynebacterium mucifaciens | 3 | | 1 (D) | — | 2 (F) | — | | Corynebacterium ureicelerivorans | 2 | | — | — | 1 (F) | — | | Total | 30 | 14 | 2 | — | 5 | 1 |
| | HACEK and other Gr(−) cocci | | Total | 18 | 8 | — | — | — | — |
| | Anaerobes | | Total | 2 | 2 | — | — | — | — |
| | Others | | Wautersiella falsenii | 1 | | — | — | 1 (G) | 1 (G) | | Total | 4 | 4 | — | — | 1 (G) | 1 (G) |
| | Total (bacteria) | 1,181 | 93 | 5 | 4 | 10 | 7 |
| | Fungi | | Aspergillus brasiliensis | 1 | | — | — | 1 (F) | — | | Total (fungi) | 160 | 14 | — | — | 1 | — |
| | Total (bacteria + fungi) | 1,341 | 107 | 5 | 4 | 11 | 7 |
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