Through the Scope Darkly: The Gut Mycobiome Comes into Focus

The gut microbiome is comprised of microbes from multiple kingdoms, including bacteria, but also fungi, viruses, and perhaps other agents. In this issue of Cell Host & Microbe , Jiang et al. (2017) reveal that fungal monocolonization after antibiotic-mediated depletion of intestinal bacteria prevents colitis and influenza, thus highlighting beneficial roles of fungi.