Table 2 Antibiotic susceptibility of 56 Escherichia coli isolates from broilers using broth microdilution test
Antibiotic | Class | S | I | R | Resistance rate (%) |
|---|---|---|---|---|---|
Penicillin (PEN) | β-Lactam | 0 | 1 | 55 | 98.2 |
Erythromycin (ERY) | Macrolide | 1 | 1 | 54 | 96.4 |
Rifampicin (RAM) | Ansamycin | 1 | 1 | 54 | 96.4 |
Trimethoprim/sulfamethoxazole (T/S) | Diaminopyrimidine/sulfonamide | 19 | 1 | 36 | 64.3 |
Streptomycin (STR) | Aminoglycoside | 12 | 14 | 30 | 53.6 |
Tetracycline (TET) | Tetracycline | 24 | 4 | 28 | 50.0 |
Ceftazidime (CAZ) | β-Lactam (cephalosporin) | 24 | 9 | 23 | 41.1 |
Amoxicillin/clavulanic acid (AMC) | β-Lactam/β-lactamase inhibitor | 29 | 12 | 15 | 26.8 |
Chloramphenicol (CMP) | Non-classified | 41 | 2 | 13 | 23.2 |
Ciprofloxacin (CIP) | Fluoroquinolone | 38 | 6 | 12 | 21.4 |
Gentamicin (GEN) | Aminoglycoside | 38 | 7 | 11 | 19.6 |
Levofloxacin (LEV) | Fluoroquinolone | 35 | 13 | 8 | 14.3 |
Amikacin (AMK) | Aminoglycoside | 43 | 7 | 6 | 10.7 |
Imipenem (IMP) | β-Lactam (carbapenem) | 48 | 7 | 1 | 1.8 |