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Prevalence of fluoroquinolone-resistant and ESBL-producing Escherichia coli infections among patients with uncomplicated and complicated pyelonephritis by study site, United States, July 2013–December 2014. Each dot indicates a study site; the line to show the general trend between fluoroquinolone resistance and ESBL-producing E. coli was generated by using simple linear regression. - ACEP Now