Table 1.
Number of isolates identified by each methoda
| Organism | Total no. of isolates | MALDI-TOF MS |
Remel RapID NH system |
Vitek 2 NH system |
||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Correctly identified to: |
Not identified | Incorrectly identified | Correctly identified to: |
Not identified | Incorrectly identified | Tests required | Correctly identified to species level | Not identified | Incorrectly identified | Tests required | ||||
| Genus level | Species level | Genus level | Species level | |||||||||||
| Haemophilus spp. | ||||||||||||||
| H. influenzae | 26 | 26 (100) | 25 (96.2) | 1 (3.8) | 23 (88.5) | 1 (3.8) | 2 (7.7) | |||||||
| H. parainfluenzae | 20 | 1 (5) | 18 (90) | 1 (5) | 1 (5) | 10 (50) | 9 (45) | 15b (78.9) | 2b (10.5) | 1b (5.3) | 1b (5.3) | |||
| H. haemolyticus | 11 | 11 (100) | 1 (9.1) | 7 (63.6) | 3 (27.2) | 2 (18.2) | 4 (36.4) | 5 (45.4) | ||||||
| H. parahaemolyticus | 6 | 6 (100) | 2 (33.3) | 4 (66.7) | 3b (60) | 2b (40) | ||||||||
| Aggregatibacter spp. | ||||||||||||||
| A. actinomycetemcomitans | 10 | 10 (100) | 10 (100) | 10 (100) | ||||||||||
| A. aphrophilus | 13 | 1 (7.7) | 10 (76.9) | 2 (15.4) | 11 (84.6) | 2 (18.1) | 8 (72.7) | 3 (27.3) | 2 (18.2) | |||||
| A. segnis | 1 | 1 (100) | 1 (100) | 1 (100) | ||||||||||
| Eikenella corrodens | 29 | 29 (100) | 29 (100) | 29 (100) | ||||||||||
| Kingella spp. | ||||||||||||||
| K. denitrificans | 4 | 3 (75) | 1 (25) | 4 (100) | 2 (50) | 1 (25) | 1 (25) | |||||||
| K. kingae | 20 | 18 (90) | 2 (10) | 20 (100) | 15b (78.9) | 1b (5.3) | 3b (15.8) | |||||||
| Total | 140 | 2 (1.5) | 121 (86.4) | 4 (2.9) | 13 (9.3) | 1 (0.7) | 85 (60.7) | 1 (0.7) | 36 (25.7) | 17 (12.1) | 106 (77.4) | 8 (5.8) | 14 (10.2) | 9 (6.6) |
a
Values represent the absolute numbers of identifications in each category for each species by a particular method. Values in parentheses are the percentages of isolate identifications made for each species by each method that fall into each category.
b
Not all isolates were tested with the Vitek 2 system. One isolate each of H. parainfluenzae, H. parahaemolyticus, and K. kingae was not available for testing with the Vitek 2 method.