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Susceptibility of antimicrobial-resistant urinary Escherichia coli isolates to fluoroquinolones and nitrofurantoin.
In vitro surveillance data from across the United States indicate that approximately 10%-20% of urinary Escherichia coli isolates from female outpatients are resistant to trimethoprim-sulfamethoxazole (TMP-SMX). Alternative therapies for uncomplicated urinary tract infections in women include fluoroquinolones and nitrofurantoin, but the activities of these agents against TMP-SMX-resistant isolates are rarely reported. Among TMP-SMX-resistant urinary E. coli isolates tested in US laboratories from 1998 through 2001, 9.5% (5767 of 60,414) were resistant to ciprofloxacin and 1.9% (1214 of 63,817) were resistant to nitrofurantoin; 10.4% of ciprofloxacin-resistant isolates (683 of 6560) were resistant to nitrofurantoin. An association between resistance to fluoroquinolones and nitrofurantoin in E. coli has not been previously reported and warrants further study.
Focus Technologies, Herndon, Virginia 20171-4603, USA. firstname.lastname@example.org, ,
Drug Resistance, Bacterial
Escherichia coli Infections
Microbial Sensitivity Tests
Trimethoprim, Sulfamethoxazole Drug Combination
Urinary Tract Infections
Pub Type(s)Journal Article
Research Support, Non-U.S. Gov't