Plasmids carrying blaCTX-M-1 and qnr genes in Escherichia coli isolates from an equine clinic and a horseback riding centre.

Objectives: The aim of this study was to determine the occurrence of extended-spectrum β-lactamase (ESBL)-producing Escherichia coli at an equine clinic and a horseback riding centre, and to discuss the impact of antimicrobial treatment on resistance selection.

Methods: Faeces from horses, environmental smears and flies were sampled at both the clinic and riding centre. Staff at the equine clinic were also examined.