Antibiotic and Bacteriocin Sensitivity of Listeria monocytogenes Strains Isolated from Different Foods

Abstract

This study aimed to determine the antibiotic and bacteriocin sensitivity of Listeria monocytogenes strains iso-lated from animal derived foods. With disc diffusion assay, all fourteen L. monocytogenes strains were susceptible to the antibiotics, including penicillin G, vancomycin, tetracycline, chloramphenicol, rifampicin, erythromycin, gentamicin and trime-thoprim. However, the percentages of fosfomycin and streptomycin resistances were 92.9% and 7.1%, re-spectively. Multiple resistances were not observed among the tested strains. The results of well diffusion assays showed that all strains were inhibited by the cell-free supernatant of a bacteriocin-producing strain, Pediococcus acidilactici 13, with the inhibition zones ranging from 16.00 to 24.50 mm. These results provide useful information on antibiotic resis-tance of L. monocytogenes strains isolated from foods, and can potentially be used to develop bacteriocin-based inter-ventions to guard against the hazards associated with L. monocytogenes in ready-to-eat meat and poultry products.