Commentary : Bacteriophage transfer during faecal microbiota transplantation in Clostridium difficile infection is associated with treatment outcome

Fecal microbiota transplantation (FMT) has been used as a treatmentof last resort for recurrent C. difficile infections (CDI) with a cure rate of 85–90% after the first FMT (van Nood et al., 2013; Jiang et al., 2017). Several studies have examined the changes that occur in the bacterial community that leads to reestablishment of the intestinal microbiota (Fuentes et al., 2014; Seekatz et al., 2014; Staley et al., 2016). However, studies that have investigated the role of viruses in FMT are limited (Broecker et al., 2016a,b, 2017; Ott et al., 2017)