Recurrence of urinary tract infections with extended-spectrum β-lactamase-producing Escherichia coli caused by homologous strains among which clone ST131-O25b is dominant.

Objectives: Bacterial features associated with recurrent urinary tract infections (RUTIs) due to extended-spectrum β-lactamase-producingEscherichia coli (ESBL-E. coli) are not well understood. In this study, phylogenetic groups and ST131 subclones were investigated to assess strain homology of ESBL-E.