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To investigate the prevalence of the clonal group Escherichia coli ST131 in urologic patients, and to clarify the mechanisms underlying the high prevalence of the antimicrobial resistant genes in ST131. We used 65 Escherichia coli strains collected from the Department of Urology, Nagasaki University Hospital, between January 2018 and December 2018. All of them underwent multilocus sequence typing and were analyzed for genes associated with quinolone resistance and extended-spectrum β-lactamases. To compare ST131 and non-ST131 strains, ba