Abstract
Surveillance studies have generally reported an increase in Escherichia coli strains resistant to major classes of antibiotics used for animals' treatment. The aim of this study was to test the susceptibility of 25 strains (isolated from 30 domestic Mallard ducks-Anas platyrhynchos, both sex, aged 8 to 14 wk, taxonomically alloted to the species E. coli using MALDI TOF mass spectrometry system) to antimicrobials (antibiotics, enterocins, and herbal extracts). Testing was performed using the agar disc method and the agar diffusion method. A total of 19 E. coli strains were multiresistant to antibiotics; but 10 of those strains were susceptible to enterocins with an inhibition activity of 100 AU/mL. All strains were susceptible to herbal extracts. These results indicate further benefit application of enterocins and herbal extracts to prevent/reduce problems caused with E. coli. Moreover, additional studies are in process.