CD40LG and type 2 diabetes mellitus: Renibacterium species were significantly increased in IgM+ bacteria in people with type 2 diabetes compared with the IgM+ bacteria in NGT and IGT groups, while two bacterial species (a Dorea species and a Lactobacillus species) differed in abundance in the IgM− bacteria between individuals with NGT and type 2 diabetes (Dorea) and IGT and type 2 diabetes (Lactobacillus).