CTX-M-type fluoroquinolone-resistant Escherichia coli: analysis of the colonization of residents and inanimate surfaces 1 year after a first case of urinary tract infection at a nursing home in France.

At a nursing home in France, 1 year after a first case of a cluster of urinary tract infections caused by an extended-spectrum beta-lactamase-producing strain of Escherichia coli, 9 (22%) of 49 residents were colonized with the outbreak strain. Colonization was associated with poor state of health (P = .04), incontinence (P = .007), and recent treatment with fluoroquinolones and/or cephalosporins (P = .003).