Skip to main content

Table 3 Antibiotic resistance profile of Listeria monocytogenes 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 Antibiotics 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 < 17 17–21 ≥ 22 24/36 7/36 5/36
Cephalosporins Ceftriaxone 30 μg < 15 15–20 ≥ 21 9/36 5/36 22/36
Cephalexin 30 μg < 12 12–17 ≥ 18 34/36 2/36 0/36
Penicillins Penicillin 10 IU < 8 8–28 ≥ 29 36/36 0/36 0/36
Amoxicillin 25 μg < 14 14–24 ≥ 25 36/36 0/36 0/36
Aminoglycosides Gentamicin 10 μg < 18 18–20 ≥ 21 9/36 27/36 0/36
Tetracyclines Tetracycline 30 μg < 22 22–24 ≥ 25 31/36 5/36 0/36
Phenicols Chloramphenicol 30 μg < 18 18–20 ≥ 21 24/36 11/36 1/36
  1. a From CLSI [33], Hansen et al. [34], CA-SFM [35]and Soussy et al. [36]
  2. b R resistant, I intermediate, S susceptible