| SL. NO. | Antimicrobial agents | Symbol | Disc concentration (µg/disc) |
| 1 | Penicillin G | P | 10 |
| 2 | Chloramphenicol | CL | 30 |
| 3 | Streptomycin | S | 10 |
| 4 | Tetracycline | TE | 30 |
| 5 | Vancomycin | VA | 30 |