“…A full review of preliminary data on the microbiome as a contributor to GVHD is outside the scope and space limitations of this article, but the interested reader is referred to recent reviews focusing on this topic [109,110]. If perturbations of the microbiome influence the occurrence of GVHD (through interaction with the innate immune system), then it may be possible to manipulate the microbiome to prevent GVHD.…”