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Male or female 18 years of age or older; individuals undergoing HSCT with fluoroquinolone prophylaxis.
The purpose of this research is to find out if fidaxomicin is safe and effective in the prevention of Clostridium-difficile associated diarrhea for people that will have a hematopoietic stem cell transplantation. The use of fidaxomicin to prevent C-diff diarrhea is considered experimental. In this research fidaxomicin will be compared with a placebo (an inactive substance).