title: Multiple Antimicrobial Resistance of Escherichia coli Isolated from Chickens in Iran.
abstract: Antimicrobial agents are used extremely in order to reduce the great losses caused by Escherichia coli infections in poultry industry. In this study, 318 pathogenic Escherichia coli (APEC) strains isolated from commercial broiler flocks with coli-septicemia were examined for antimicrobials of both veterinary and human significance by disc diffusion method. Multiple resistances to antimicrobial agents were observed in all the isolates. Resistance to the antibiotics was as follows: Tylosin (88.68%), Erythromycin (71.70%), Oxytetracycline (43.40%), Sulfadimethoxine-Trimethoprim (39.62%), Enrofloxacin (37.74%), Florfenicol (35.85%), Chlortetracycline (33.96%), Doxycycline (16.98%), Difloxacin (32.08%), Danofloxacin (28.30%), Chloramphenicol (20.75%), Ciprofloxacin (7.55%), and Gentamicin (5.66%). This study showed resistance against the antimicrobial agents that are commonly applied in poultry, although resistance against the antibiotics that are only applied in humans or less frequently used in poultry was significantly low. This study emphasizes on the occurrence of multiple drug resistant E. coli among diseased broiler chickens in Iran. The data revealed the relative risks of using antimicrobials in poultry industry. It also concluded that use of antibiotics must be limited in poultry farms in order to reduce the antibiotic resistances.
authors.affiliation: Department of Basis Sciences, Faculty of Veterinary Medicine, Islamic Azad University, Shahrekord Branch, P.O. Box 166, Shahrekord, Iran.
authors.forename: Reza
authors.initials: R
authors.lastname: Talebiyan
authors.affiliation: Faculty of Veterinary Medicine, Islamic Azad University, Shahrekord Branch, Shahrekord, Iran.
authors.forename: Mehdi
authors.initials: M
authors.lastname: Kheradmand
authors.affiliation: Young Researchers and Elite Club, Islamic Azad University, Shahrekord Branch, Shahrekord, Iran.
authors.forename: Faham
authors.initials: F
authors.lastname: Khamesipour
authors.affiliation: Department of Microbiology, Islamic Azad University, Shahrekord Branch, Shahrekord, Iran.
authors.forename: Mohammad
authors.initials: M
authors.lastname: Rabiee-Faradonbeh