MAPT and Cognitive impairment: An early increase in microglial activation persisted from 0-day to 90-day post-injury, compounded by substantial increases in astrocyte reactivity and phosphorylated tau.Few differences in the microbial community were observed in mice exposed to repetitive, mild TBI (rmTBI).The progressive emergence of white matter damage and cognitive deficits following rmTBI was not associated with the altered gut microbiota.