| Formation diagonal circulars | Sample | |
| Staphylococcus aureus | Escherichia coli | |
| 25 mm | 21 mm | B |
| 20 mm | 18 mm | C1 |
| 24 mm | 20 mm | C2 |
| 20 mm | 22 mm | C3 |
| 19 mm | 20 mm | C4 |