TABLE 2.
Difficulties encountered with the RapID CB Plus identification system
| Taxon (no. of strains) | Problem |
|---|---|
| Arcanobacterium pyogenes (5) | Pyrrolidonyl aminopeptidase-positive strains not recognized |
| Corynebacterium afermentans subsp. afermentans (5) | False-positive reactions for acid production from carbohydrates, false-positive aminopeptidase activities |
| Corynebacterium argentoratense (2) | False-negative reaction for acid production from glucose |
| Corynebacterium bovis (2) | False-negative β-galactosidase reaction |
| CDC group G bacteria (2) | Proline aminopeptidase-negative strains not recognized |
| Corynebacterium glucuronolyticum (3) | Various enzymes (alkaline phosphatase-positive strains, β-glucosidase-positive strains) |
| Corynebacterium minutissimum (1) | Pyrrolidonyl aminopeptidase-positive strain not recognized |
| “Corynebacterium aquaticum” (3) | Acid production from carbohydrates not recognized |
| Exiguobacterium acetylicum (1) | Maltose-negative and esterase-positive strain not recognized |
| Listeria grayi-Listeria murrayi (1) | False-negative N-acetyl-β-glucosaminidase reaction |
| Microbacterium spp. (2) | Identified as the closely related Cellulomonas spp. and Oerskovia spp. |
| Oerskovia spp. (1) | Proline aminopeptidase-negative strain not recognized |
| Rhodococcus equi (1) | Glucose-positive and α-glucosidase-negative strain not recognized |
| Rothia spp. (2) | Glycosidase-positive strains not recognized |