Abstract
Most cases of antibiotic-associated diarrhoea are due to Clostridium difficile or are enigmatic. Patients with C. difficile-associated disease are more likely to have colitis, severe disease and nosocomial acquisition. The preferred diagnostic test is a C. difficile toxin assay using a tissue culture assay or enzyme immunoassay. The usual treatment is withdrawal of the inducing agent, sometimes supplemented with oral vancomycin or metronidazole. Response rates approach 100%; the major complication is relapse. Major complications include toxic megacolon, devastating diarrhoea, pseudomembranous colitis and hypoalbuminemia. Antibiotic-associated diarrhoea with negative tests for C. difficile toxin is usually dose-related and responds to antibiotic withdrawal.
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