- Patients will be evaluated by a member of the research team at CDI diagnosis. Specific treatment will be revised by the investigator with patient's physician in order to adapt it to the clinical guidelines, depending on the severity of the episode and the existence of previous episodes. Concomitant antibiotic treatments will be dropped or adjusted if possible. It is important to clarify that the study investigator will always make a suggestion according to the current evidence, but the final decision about treatment will be always made by patient's physician in charge.