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The aim of this study was to investigate the risk factors associated with CTX-M-producing Escherichia coli strains isolated from infected or colonized patients. From 191 clinical samples, a case–control study was designed. From January 2005 to December 2007, 98 hospitalized patients infected or colonized with CTX-M-producing E. coli were included in the study. They were matched 1 : 1 with controls...
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