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The aim of this study was to determine the main serotypes of avian-associated E. coli and their susceptibilities to common antimicrobial agents used in Iranian poultry industry. Furthermore the invasion characteristics of the poultry-associated isolates were evaluated. Eighty Escherichia coli (E. coli) strains were isolated from 63 broiler farms with colibacillosis clinical signs in Mazandaran province, northern of Iran. Antibacterial susceptibility testing of the isolates with ten selected antibiotics was conducted according to the standard methods and avian pathogen serotypes, O1, O2, O18 and O78:K80, were determined using the specific antisera. In addition, invasion properties of the isolates were examined based on Congo red dye agar test. According to the results, 73.75%, 71.25% and 65% of isolates were resistant to oxytetracycline, tetracycline and erythromycin, respectively, while resistance rates against enrofloxacin, florfenicol and norfloxacin were 7.5%, 7.5% and 2.5% respectively. The O78 and O1 were the predominant serotypes among E. coli isolates. Nine resistance patterns were observed in the E. coli isolates with predominant patterns being distributed widely across broilers indicating a striking diversity of resistance patterns in the areas. Cross-resistance between animal and human antimicrobial agents may be possible, thus, their proper usage in veterinary medicine is necessary.

Antibiotic susceptibility, serotyping and pathogenicity evaluation of avian escherichia coli isolated from broilers in northern Iran