The Thai Journal of Veterinary Medicine


Oral and faecalsamples were collected from thirty four dogs with periodontal disease in Chiang Mai, Thailand to investigate the prevalence of Extended Spectrum Beta Lactamase -producing E. coli(ESBL-EC) and to determine the antimicrobial resistance patterns of isolatesagainst 12 antimicrobial agents. Ten of thirty-four dogs (29.41%) were positive for ESBL-EC, one dog (2.94%) was positive from an oral sample and nine dogs (26.47%) were positive from faecal samples. All ESBL-EC isolates were multi-drug resistant (i.e. against ≥ 3 antimicrobial classes). All isolates were 100% resistant to Ampicillin, Cefazolin, Cephalexin, Ciprofloxacin and Clindamycin, and 100% susceptible to Imipenem. AMP-AMC-KZ-CL-ATM-DO-CIP-SXT-DA was the most common resistance pattern identified.

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