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Saccharomyces boulardii is widely used as a probiotic compound and is generally thought to be safe. We report one case of fungemia caused by Saccharomyces cerevisiae occurring in an elderly patient treated orally with S. boulardii in association with vancomycin for Clostridium difficile colitis. We do not recommend administering this viable yeast particularly in debilited patient with active colitis.
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Cherifi et al. (2004) studied this question.
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