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Journal of Medical Sciences
Year: 2006  |  Volume: 6  |  Issue: 1  |  Page No.: 99 - 102

Prevalence of Bacterial Resistance to Commonly Used Antimicrobials among Escherichia coli Isolated from Chickens in Kerman Province of Iran

Gholamreza Sepehri and Hassan Abbass- Zadeh    

Abstract: The objective of this study was to determine antimicrobial resistance rate of Escherichia coli isolates from chickens against commonly used antimicrobials in veterinary medicine. A total of 200 faecal samples of chickens were analyzed for pathogenic E. coli. Isolates were subjected to antimicrobial resistance testing by the disc diffusion method. The microbial resistance of tylosin, oxytetracycline, linco-spectin, neomycin, sulfadiazine/trimethoprim, enrofloxacin, difloxacin, flumequine and forphenical were determined. Out of 200 bacterial isolates 96% were identified as E. coli. A high prevalence of resistance were observed in E. coli for commonly used antibiotics in poultry medicine, tylosin (100%), oxytetracycline (94.8%), sulfadiazine/trimethprim (80.7%), flumequine (79.7%), neomycin (79.2%), difloxacin (78.7%), enrofloxacin (65.5%). The least resistance rate of E. coli isolates were observed for florphenicol (4.2%) and linco-spectin (4.2%). Findings from this study indicates high resistance rate of E. coli to commonly used antibiotics, therefore, the use of antimicrobial agents should be restricted to treating infections and call for banning of antimicrobials as growth promoters in poultry industry.

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