Inclusion Criteria:  1. or 2. CDI (within a year) defined as: > 3 bowel movements of Bristol 6-7 per day and positive stool CD-test. Age 18 years or higher.  Exclusion Criteria:  Pregnancy Does not speak or understand the Danish language Current antibiotic treatment other than vancomycin Current treatment with potential interations with vancomycin Allergy to vancomycin Previous anaphylactic reactions due to food allergies Continuous need for proton pump inhibitor Documented gastroparesis Fulminant CDI