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Table 2 Antibiotic resistance profile of Escherichia coli isolates from raw kebab and hamburger samples

From: Antibiotic resistance in the pathogenic foodborne bacteria isolated from raw kebab and hamburger: phenotypic and genotypic study

Antibiotic class Specific antibiotic tested Concentration Interpretive categories and zone diameter breakpoints (nearest whole mm)a No. of isolates/Total isolates
Rb I S R I S
Macrolides Azithromycin 15 μg ≤ 12 ≥ 13 34/59 25/59
Cephalosporins Ceftriaxone 30 μg ≤ 19 20–22 ≥ 23 7/59 6/59 46/59
Cephalexin 30 μg ≤ 14 ≥ 15 51/59 8/59
Penicillins Penicillin 10 IU ≤ 14 ≥ 15 59/59 0/59
Amoxicillin 25 μg ≤ 13 14–16 ≥ 17 47/59 5/59 7/59
Aminoglycosides Gentamicin 10 μg ≤ 12 13–14 ≥ 15 5/59 0/59 54/59
Tetracyclines Tetracycline 30 μg ≤ 11 12–14 ≥ 15 38/59 3/59 18/59
Phenicols Chloramphenicol 30 μg ≤ 12 13–17 ≥ 18 8/59 11/59 40/59
  1. a From CLSI [32]
  2. b R resistant, I intermediate, S susceptible