Table 2 Comparison of the sensitivities of Vitek 2 and MALDI-TOF MS in the identification of Gram positive bacteria to the species and genus levels
Organism (n) | Number (%) of isolates with Correct identification to the species level: | Number (%) of isolates with Correct identification to the genus level: | ||||
|---|---|---|---|---|---|---|
Vitek 2 | MALDI-TOF MS | P value | Vitek 2 | MALDI-TOF MS | P value | |
Staph aureus (33) | 33 (100.0) | 33 (100.0) | 33 (100.0) | 33 (100.0) | ||
CoNS (48) | 37 (77.1) | 48 (100.0) | 0.000 | 48 (100.0) | 48 (100.0) | |
Staph capitis (3) | 3 (100.0) | 3 (100.0) | 3 (100.0) | 3 (100.0) | ||
Staph cohnii (1) | 1 (100.0) | 1 (100.0) | 1 (100.0) | 1 (100.0) | ||
Staph epidermidis (10) | 9 (90.0) | 10 (100.0) | 0.305 | 10 (100.0) | 10 (100.0) | |
Staph hemolyticus (6) | 3 (50.0) | 6 (100.0) | 0.046 | 6 (100.0) | 6 (100.0) | |
Staph hominis (2) | 2 (100.0) | 2 (100.0) | 2 (100.0) | 2 (100.0) | ||
Staph saprophyticus (23) | 18 (78.3) | 23 (100.0) | 0.018 | 23 (100.0) | 23 (100.0) | |
Staph sciuri (1) | 1 (100.0) | 1 (100.0) | 1 (100.0) | 1 (100.0) | ||
Staph simulans (1) | 0 (0.0) | 1 (100.0) | 1 (100.0) | 1 (100.0) | ||
Staph succinus (1) | 0 (0.0) | 1 (100.0) | 1 (100.0) | 1 (100.0) | ||
Strep mitis/oralis (4) | 3 (75.0) | 4 (100.0) | 0.285 | 4 (100.0) | 4 (100.0) | |
Strep pneumoniae (3) | 3 (100.0) | 3 (100.0) | 3 (100.0) | 3 (100.0) | ||
Enterococcus (22) | 16 (72.7) | 22 (100.0) | 0.008 | 21 (95.5) | 22 (100.0) | |
Enterococcus avium (1) | 1 (100.0) | 1 (100.0) | 1 (100.0) | 1 (100.0) | ||
Enterococcus faecalis (11) | 9 (81.8) | 11 (100.0) | 0.138 | 10 (90.9) | 11 (100.0) | 0.306 |
Enterococcus faecium (7) | 4 (57.1) | 7 (100.0) | 0.051 | 7 (100.0) | 7 (100.0) | |
Enterococcus gallinarum (1) | 1 (100.0) | 1 (100.0) | 1 (100.0) | 1 (100.0) | ||
Enterococcus hirae (2) | 1 (50.0) | 2 (100.0) | 0.248 | 2 (100.0) | 2 (100.0) | |
Aerococcus viridans (1) | 1 (100.0) | 1 (100.0) | 1 (100.0) | 1 (100.0) | ||
Total (111) | 93 (83.8) | 111 (100.0) | 0.000 | 110 (99.1) | 111 (100.0) | 0.316 |