These reports estimate the rate of hospital re-admission with Clostridium difficile (C. difficile) infection (identified using International Classification of Diseases, Ninth Revision, Clinical Modification [ICD-9-CM] code 008.45) following treatment with oral vancomycin, fidaxomicin, or metronidazole. Data from January 1, 2000 to December 31, 2012 from 18 Data Partners contributing to the Mini-Sentinel Distributed Database (MSDD) were utilized for the two reports that encompass this request. This request was distributed to Data Partners on August 27, 2013. Report 1 contains results from the first run, which has a query period of May 1, 2011 to December 31, 2012. Report 2 has a query period of January 1, 2000 to December 31, 2012.