Table 4.
Biochemical tests that failed during the identification process by the VITEK® 2 system and by the conventional phenotypic methods
| No. | Genotypic identification | Conventional phenotypic method | VITEK® 2 system | ||
|---|---|---|---|---|---|
| Identification | Identification | Incorrect test | Identification | Incorrect test | |
| 3 | Staphylococcus epidermidis | Staphylococcus epidermidis | 0 | Staphylococcus hominis | dMNE−; TRE + |
| 2 | Staphylococcus epidermidis | Staphylococcus epidermidis | 0 | Staphylococcus lentus | PolyB− |
| 1 | Staphylococcus epidermidis | Staphylococcus epidermidis | 0 | Staphylococcus cohnii | SUC−; dTRE + |
| 3 | Staphylococcus hominis | Staphylococcus hominis | 0 | Staphylococcus haemolyticus | PyrA+; dMAN+ |
| 2 | Staphylococcus hominis | Staphylococcus epidermidis | THIO+ | Staphylococcus hominis | 0 |
| 2 | Staphylococcus haemolyticus | Staphylococcus warneri | URE+ | Staphylococcus haemolyticus | 0 |
| 1 | Enterococcus faecalis | Enterococcus faecalis | 0 | Enterococcus gallinarum | dSOR−; dRAF+ |
| 1 | Staphylococcus capitis | Staphylococcus capitis | 0 | Staphylococcus cohnii | βGAL+; βGUR+; SUC−; dTRE+ |
| 1 | Staphylococcus epidermidis | Staphylococcus haemolyticus | URE− | Staphylococcus haemolyticus | PyrA+; URE−, PolyB−; TRE+; dMNE− |
| 1 | Staphylococcus epidermidis | Staphylococcus epidermidis | 0 | Staphylococcus lugdunensis | PyrA+; dTRE+ |
| 1 | Staphylococcus epidermidis | Staphylococcus epidermidis | 0 | Staphylococcus scuri | PolyB−; βGUR+; NAG (+); dMAN+; dTRE+ |
| 1 | Staphylococcus epidermidis | Staphylococcus epidermidis | 0 | Staphylococcus capitis | SUC−; dMAL−; PolyB−; URE− |
| 1 | Staphylococcus haemolyticus | Staphylococcus haemolyticus | 0 | Staphylococcus warneri | 0 |
| 1 | Klebsiella pneumoniae | Klebsiella oxytoca | Indol+ | Klebsiella pneumoniae | 0 |
dMNE d-mannose, dTRE d-trehalose, PolyB polymyxin B, SUC sucrose, PyrA l-pyrrolidonylarylamidase, dMAN d-mannitol, dSOR d-sorbitol, dRAF d-raffinose, URE urea, βGAL beta-galactosidase, THIO thioglycolatebroth, βGUR beta-glucuronidase, NAG N-acetylglucosamine, 0 no errors in the tests