Multi-omics Dissection of Gut Microbiome Engraftment During FMT

Patients will receive a first donor FMT by colonoscopy, after a pre-conditioning with vancomycin and neomycin + bacitracin for 3 days, because data from our group show that pre-FMT antibiotics are associated with higher rates of microbial engraftment. Then they will receive two cycles, respectively after 3 and 7 days after colonoscopy - FMT, of frozen donor FMT capsules (15 capsules b.i.d. per 3 days). Patients will always receive feces from the same donor.