TABLE 2.
Phenotypic and biochemical characteristics comparison between Rothia-like and C. nigricans
| Criterion | Result for organisma
|
|
|---|---|---|
| Rothia-like | C. nigricans | |
| Production of: | ||
| Catalase | Positive | Positive |
| Oxidase | Negative | Negative |
| Citrate | Negative | Negative |
| Urea | Negative | Negative |
| Indol | Negative | Negative |
| Gelatinase | Positive | Negative |
| Fermentation of: | ||
| Glucose | Positive | Positive |
| Sucrose | Positive | Positive |
| Maltose | Positive | Positive |
| Xylose | Negative | Negative |
| Lactose | Negative | Negative |
| Motility | Negative | Negative |
| Nitrate reduction | Positive | Negative |
| Esculin hydrolysis | Positive | Negative |
| CFA | Branched-chain type; similarity index values 0.3 to 0.4 to Rothia dentocariosa | Straight-chained, saturated, monounsaturated; similarity index values 0.4 to 0.6 to Corynebacterium spp. |
a
Rothia-like organisms are from sputa or respiratory sources; C. nigricans is from vaginal or vulval ulcers.