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19563 Background: Clostridium difficle infection is a major cause of morbidity and mortality in hospitalized patients. The recent use of cancer chemotherapy agents is a frequently cited risk factor but there is a paucity of evidence to this regard. Objective: To determine if an association exists between C. difficile infection requiring hospitalization and recent chemotherapy in patients with cancer. Design: A retrospective case control study. Setting: Community Teaching Hospital Participants: 357 cancer patients admitted with diarrhea or developed diarrhea during their hospital stay that were tested for C. difficile diarrhea via toxin assay over a 2 year period. Outcome Measurements: C. difficile infection using tests for toxin A and or B in stool. Results: Eighty-nine cases had stool positive for C. difficile toxin whereas 267 controls were negative. 30/89 (33%) cases and 90/268 (33%) controls were found to have chemotherapy in the six weeks before collection of stool for toxin assay (Odds Ratio (OR) 1.09, p=1.0 using Pearson Chi square). Factors associated with infection on logistic regression analysis included recent antibiotic usage (OR 1.99, 95% CI 1.01- 3.93),hospitalization in preceding 2 wks with OR 4.1 (95%CI 2.39–7.05) and institutionalization with OR 2.13 (95 % CI 1.03–4.39). Conclusions: C .difficile infection in cancer patients is more likely in recently institutionalized or hospitalized patients who have received recent antibiotics, but not patients with recent chemotherapy. No significant financial relationships to disclose.