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Table 1 Percentages of E. coli isolates from avian and human sources susceptible (S), intermediate (I) and resistant (R) to antimicrobial agents by NCCLS disc diffusion methods.

From: Antimicrobial resistance of Escherichia coliisolates from broiler chickens and humans

Antimicrobial agent (μg) Diffusion zone breakpoint (mm) Avian isolates (n = 34) Human isolates (n = 48)
   S I R S I R
Aminoglycosides        
   Gentamicin (10) ≤ 12 100 0 0 60.4 6.3 33.3
   Kanamycin (30) ≤ 13 2.9 5.9 91.2 8.3 18.8 43.8
β-lactams        
   Ampicillin (10) ≤ 13 73.5 5.9 20.6 58.3 6.3 35.4
   Amoxicillin/clavulanate (20) ≤ 13 85.3 11.8 2.9 79.2 18.8 2.1
Phenicols        
   Chloramphenicol (30) ≤ 12 88.2 8.8 2.9 68.8 6.3 25
Quinolones        
   Ciprofloxacin (5) ≤ 15 64.7 26.5 8.8 89.6 0 10.4
   Enrofloxacin (5) ≤ 17 32.4 38.2 29.4 89.6 0 10.4
   Nalidixic acid (30) ≤ 13 11.8 2.9 85.3 89.6 0 10.4
   Norfloxacin (5) ≤ 12 64.7 14.7 20.6 91.7 2.1 6.3
   Ofloxacin (5) ≤ 12 85.3 2.9 11.8 91.7 0 8.3
Tetracyclines        
   Tetracycline (30) ≤ 14 17.6 0 82.4 39.6 16.7 43.8