Among hospitalized patients with diarrhea who underwent testing for C difficile toxin, age 75 years or older, hospitalization for 7 days or greater, and recent exposure to cefazolin or levofloxacin were important predictors of a positive CDTT. These findings may help in the initiation of early presumptive treatment for CDAD, and appropriate isolation of higher risk patients before results become available. In addition, consideration of these risk factors may help in deciding whether a CDTT should be repeated when the first test is negative. Our study also supports more judicious use of antibiotics, particularly cefazolin and levofloxacin, in reducing the risk of CDAD in hospitalized patients.
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