The registry collects cases of patients received fecal microbiota transplantation (FMT) due to Clostridium difficile associated diarrhea (CDAD). The main objective of this study is to analyze the safety and effectiveness of FMT. Furthermore, data analysis will be used to implement a standardization of FMT in German hospitals and improve patient outcome. Therefore, a detailed description of completions of FMT are documented on our web-based survey platform www.ClinicalSurveys.net.