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Table 2 Antibiotic susceptibility of 56 Escherichia coli isolates from broilers using broth microdilution test

From: Antimicrobial resistance in Enterobacteriaceae from healthy broilers in Egypt: emergence of colistin-resistant and extended-spectrum β-lactamase-producing Escherichia coli

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
  1. S susceptible, I intermediate, R resistant