Table 3.
Identification Rates using MALDI-TOF MS Devices
| Results by Conventional
Identification Protocols |
VITEK-MS | Microflex LT | ||||||
| L1R | L1R & L2R | L1R | L1R & L2R | |||||
| Single | Formic
acid |
Single | Formic
acid |
Single | Formic
acid |
Single | Formic
acid |
|
| Bacillus spp. | 2/47 | 2/47 | 42/47 | 45/47 | 40/47 | 45/47 | 46/47 | 46/47 |
| Corynebacterium spp. | 14/18 | 16/18 | 15/18 | 17/18 | 10/18 | 12/18 | 15/18 | 16/18 |
| Staphylococcus spp. | 8/8 | 8/8 | 8/8 | 8/8 | 5/8 | 6/8 | 6/8 | 7/8 |
| Streptococcus spp. | 4/5 | 4/5 | 5/5 | 5/5 | 4/5 | 4/5 | 5/5 | 5/5 |
| Peptostreptococcus spp. | 1/1 | 1/1 | 1/1 | 1/1 | 1/1 | 1/1 | 1/1 | 1/1 |
| Gram-positive rods | 3/5 | 3/5 | 4/5 | 4/5 | 3/5 | 3/5 | 4/5 | 4/5 |
| Gram-positive cocci | 3/3 | 3/3 | 3/3 | 3/3 | 2/3 | 3/3 | 3/3 | 3/3 |
| Glucose non-fermenting
Gram-negative rods |
9/10 | 9/10 | 10/10 | 10/10 | 4/10 | 4/10 | 9/10 | 10/10 |
| Gram-negative rods | 1/1 | 1/1 | 1/1 | 1/1 | 1/1 | 1/1 | 1/1 | 1/1 |
| Anaerobic bacteria | 2/2 | 2/2 | 2/2 | 2/2 | 1/2 | 1/2 | 2/2 | 2/2 |
| Total | 47/100
(47%) |
49/100
(49%) |
91/100
(91%) |
96/100
(96%) |
71/100
(71%) |
80/100
(80%) |
92/100
(92%) |
95/100
(95%) |
L1R: Level 1 Reliability, meaning species-level identification
L2R: Level 2 Reliability, meaning genus-level identification