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Antimicrobial resistance for common UTI drug increases five fold since 2000

In a surveillance study of over 12 million bacteria, investigators at The George Washington University and Providence Hospital found E. coli antimicrobial resistance to ciprofloxacin, the most commonly prescribed antimicrobial for urinary tract infections in the U.S., increased over five-fold from 2000 to 2010. In addition, nearly one in four isolates in 2010 were resistant to trimethoprim-sulfamethoxazole (Bactrim®), the second most commonly prescribed drug for this infection. This research was published in the April edition of the journal, Antimicrobial Agents and Chemotherapy.

"Our study is important because it shows that E. coli resistance to two common drugs to treat UTIs rose substantially over the last decade. For patients, this will ultimately translate into more expensive and sometimes more complex antimicrobial treatments. What is more concerning however, is the lack of new antimicrobial drug development which has been declining for decades," said Guillermo Sanchez, a graduate student in the Physician Assistant program at the George Washington University and primary author of the study.

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