|
| Characteristics | D17 | D22 | D23 |
| Macroscopic observations | Colonies | Irregular | Regular | Irregulars |
| Edge | regular | regular | Irregulars | |
| Elevation | Bulging | Bulging | Semi-convex | |
| Area | Brilliant | Brilliant | Rough | |
| Color | Whitish | Pink | Whitish | |
| Breathing mode | Aerobic | Aerobic | Aerobic | |
| Microscopic observations | Form | Stick | Shell | Stick |
| Mobility | Negative | Positive | Negative | |
| Gram stain | Negative | Negative | Negative | |
| Biochemical tests | Catalase | Positive | Positive | Positive |