C. Difficile Toxin Levels in Stool From Healthy Individuals Following Standard of Care Antibiotic Treatment for CDI.

Hospitals and clinics interested in participating in this multi-site study, please contact the people mentioned under "Contacts and Locations". The goal of this study is to map the risk of having a C. Difficile infection recurrence (rCDI) after being treated with standard-of-care antibiotics for a C. Difficile infection. The main questions it aims to answer are: * What is the recurrence rate of CDI in the 8 weeks following antibiotic treatment for a first recurrence of CDI? * Does toxin levels of Toxin A and/or B from C. Diff. at baseline predict CDI recurrence risk? Participants will: * Undergo standard of care Antibiotic treatment for first recurrence of CDI * Visit their clinic at 4 different visits over a time period of approximately 9 weeks. (Visits can also be performed remote/via phone call.)