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D. The Overuse of Broad-spectrum Antibiotics Leads to Resistance

Narrator: This is Science Today. A new study suggests practitioners are over-prescribing broad-spectrum antibiotics called fluoroquinolones, which target multiple organisms at once. Joseph Guglielmo, who led the University of California, San Francisco study, says this overuse accelerates bacterial resistance to the drugs and reduces their ability to treat infections.

Guglielmo:We believe that the very broad use of these antibiotics, these quinolones antibiotics - by using them inappropriately, it essentially is taking away a very important option that we did use in the past.

Narrator: Guglielmo says using narrow-spectrum antibiotics that target the offending organisms is a better approach.

Guglielmo: We believe that practitioners need to weigh the value of culturing up their patients, of using the results to streamline therapy toward the most narrow-spectrum antibiotic that possibly can be used.

Narrator: For Science Today, I'm Larissa Branin.