Low eukaryotic viral richness is associated with faecal microbiota transplantation success in patients with UC

We read with interest the recent Gut study by Zuo and colleagues showing that a good outcome of faecal microbiota transplantation (FMT) in Clostridium difficile infection (CDI) was associated with bacteriophage transfer.1 FMT is an established treatment to restore a balance in disturbed intestinal microbiotas of patients with CDI,2 3 and recent multicentre randomised, double-blind, placebo-controlled trials showed its effectiveness in inducing clinical and endoscopic remission in patients with UC.4 We examined the gut virome dynamics of nine patients with UC who were undergoing FMT (64 patient and 8 healthy donor samples).5 Two patients with UC achieved long-lasting complete remission with mucosal healing (>2 years; figure 1: patient 1 and 3), and one patient reported temporary remission for 6 weeks (figure 1; patient 4).5 The remaining six patients did not respond to treatment....

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