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Germs Behind Urinary Tract Infections Becoming More Resistant to Drugs

Germs Behind Urinary Tract Infections Becoming More Resistant to Drugs

05/04/12

FRIDAY, May 4 (HealthDay News) -- E. coli bacteria's resistance to ciprofloxacin (Cipro), the most widely prescribed antimicrobial for urinary tract infections in the United States, increased five-fold between 2000 and 2010, according to a new study.

The surveillance study of more than 12 million bacteria also found that nearly one-fourth of E. coli in 2010 were resistant to trimethoprim-sulfamethoxazole (brand name Bactrim), the second most commonly prescribed drug for urinary tract infections.

The study was published in the April issue of the journal Antimicrobial Agents and Chemotherapy.

E. coli accounts for 75 percent to 95 percent of urinary tract infections, which are among the most common infections in humans. Half of all women experience at least one urinary tract infection in their lifetime.

E. coli antimicrobial resistance reduces the likelihood of clinical cure, increases the risk of infection recurrence and increases treatment costs and hospitalization rates.

"Our study is important because it shows that E. coli resistance to two common drugs to treat [urinary tract infections] rose substantially over the last decade," lead study author Guillermo Sanchez, a graduate student in the physician assistant program at George Washington University in Washington, D.C., said in a university news release.

"For patients, this will ultimately translate into more expensive and sometimes more complex antimicrobial treatments," Sanchez said. "What is more concerning, however, is the lack of new antimicrobial drug development, which has been declining for decades."

There are other antimicrobial drugs available to treat urinary tract infections, but they are more likely to cause side effects such as gastrointestinal problems, nausea and vomiting.

"Our study reveals that ciprofloxacin and [trimethoprim-sulfamethoxazole] are no longer safe for outpatient urinary tract infection," Dr. Jose Bordon, an infectious disease specialist at Providence Hospital in Washington, D.C., said in the news release. "Our study indicates that safer antimicrobials for outpatient [urinary tract infection] are nitrofurantoin in patients without kidney insufficiency and amoxicillin/clavulanate and third-generation cephalosporins for all others."

More information

The American Academy of Family Physicians has more about urinary tract infections.

Copyright © 2012 HealthDay. All rights reserved.

Please be aware that this information is provided to supplement the care provided by your physician. It is neither intended nor implied to be a substitute for professional medical advice. CALL YOUR HEALTHCARE PROVIDER IMMEDIATELY IF YOU THINK YOU MAY HAVE A MEDICAL EMERGENCY. Always seek the advice of your physician or other qualified health provider prior to starting any new treatment or with any questions you may have regarding a medical condition.

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