We would like to congratulate several of our colleagues under the leadership of Associate Professor Gardlik for the publication of an outstanding article on the role of the gut microbiota in the pathogenesis and progression of rheumatoid arthritis in an animal model of collagen-induced arthritis. The findings revealed distinct patterns of microbiota clustering after fecal microbial transplantation (FMT) in the experimental groups, highlighting strain-specific colonization effects. Strains such as Bifidobacterium and Paraprevotella were positively correlated with arthritis severity, while Corynebacterium, Enterorhabdus and Odoribacter showed negative correlations, suggesting potential protective roles. Despite these microbial differences, minor differences in arthritis scores, paw inflammation, or systemic inflammation were observed between FMT groups.