Table 4.
Comparison between confidence scores of MALDI-MS and VITEK 2 methods and identification levels of 22 samples of bacteria (Chryseobacterium indologenes and Elizabethkingia meningoseptica)
| Identification level | MALDI-MS score |
||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| 99.9% to 90% |
89.9% to 85% |
<85% |
Inconclusive |
||||||||
| VITEK 2 score |
VITEK 2 score |
VITEK 2 score |
VITEK 2 score |
||||||||
| Ex | VG | Good | Ex | LDis | Ex | VG | Good | Ex | VG | LDis | |
| Genus/species | 4 | 1 | 2 | ||||||||
| Genus | 1 | 1 | 1 | ||||||||
| Discrepancy | 1 | 1 | 1 | 2 | 1 | 4 | 1 | 1 | |||
| Total | 5 | 1 | 1 | 2 | 1 | 3 | 2 | 1 | 4 | 1 | 1 |
Data are shown as number of samples.
Ex, excellent; INC, inconclusive; LDis, low discrimination; MALDI-MS, MALDI-TOF VITEK MS (bioMérieux, Marcy l’Étoile, France); MALDI-TOF, matrix-assisted laser desorption/ionization time-of-flight mass spectrometry; VG, very good; VITEK 2, VITEK 2 automated phenotypic method (bioMérieux).