TABLE 1.
Discrepancies in species identification by the VITEK 2 NH system and reference methods
| Species (reference identification) | No. of strains tested | No. (%) of strains with indicated result by reference methods
|
No. (%) of strains with indicated type of identification by the VITEK 2 NH system
|
||||
|---|---|---|---|---|---|---|---|
| No identification | Mis- identification (species) | Genus identification | Correct | With low discrimination (possible species) | Correct after additional tests | ||
| Campylobacter coli | 9 | 0 | 0 | 9 (100) | 9 (100) | 0 | |
| Campylobacter jejuni | 27 | 0 | 0 | 27 (100) | 24 (88.8) | 3 (C. coli-C. jejuni) | 27 (100) |
| Gardnerella vaginalis | 18 | 0 | 0 | 18 (100) | 18 (100) | 0 | |
| Haemophilus influenzae | 25 | 2 | 0 | 23 (92) | 21 (84) | 2 (H. influenzae-H. haemolyticus) | 23 (92) |
| Haemophilus parainfluenzae | 27 | 1 | 0 | 26 (96) | 25 (92.5) | 1 (H. parainfluenzae-H. segnis) | 26 (96.2) |
| Moraxella catarrhalis | 5 | 0 | 0 | 5 (100) | 5 (100) | 0 | |
| Neisseria gonorrhoeae | 12 | 0 | 1 (N. cinerea) | 12 (100) | 11 (91.6) | 0 | |
| Neisseria meningitidis | 41 | 0 | 0 | 41 (100) | 39 (95.1) | 1 (N. meningitidis-N. sicca); 1 (N. meningitidis-K. denitrificans) | 41 (100) |
| Neisseria cinerea | 1 | 0 | 0 | 1 | 1 | ||
| Neisseria elongata subsp. elongata | 1 | 0 | 0 | 1 | 0 | 1 (N. elongata-E. corrodens) | 1 |
| Neisseria lactamica | 6 | 0 | 0 | 6 (100) | 6 (100) | ||
| Neisseria sicca | 1 | 0 | 0 | 1 | 1 | ||
| HACEK group | |||||||
| Capnocytophaga spp. | 1 | 0 | 0 | 1 | 1 | ||
| Cardiobacterium hominis | 2 | 1 | 0 | 1 | 1 | ||
| Haemophilus actinomycetemcomitansa | 2 | 0 | 0 | 2 | 2 | ||
| Haemophilus aphrophilus or H. paraphrophilus | 2 | 1 | 0 | 1 | 0 | 1 (H. aphrophilu-H. segnis) | 1 |
| Kingella denitrificans | 1 | 0 | 0 | 1 | 0 | 1 (K. denitrificans-N. cinerea) | 1 |
| Eikenella corrodens | 7 | 0 | 0 | 7 (100) | 7 (100) | 0 | |
| Total | 188 | 5 (2.7) | 1 (0.5) | 184 (97.8) | 171 (91) | 11 (5.8) | 182 (96.8) |
a
Formerly Actinobacillus actinomycetemcomitans.