MUC5AC and infection: RVA infection increased the abundance of the mucin-degrading Bacteroides in mice8, humans233 and piglets.236 The abundance of a member of the genus Lactobacillus, lacking mucin-degrading activity, was decreased during the first 3 days of RV infection in mice.8 Remarkably, both, mucin stores and gut microbiota composition were fully restored to the pre-infection levels at day 3 post-infection in a strain-specific manner: RVA infection led to increased abundance of B. fragilis, whereas the abundance of B. vulgatus and B. stercoris was decreased.