Prevotella copri and microbiota in rheumatoid arthritis: Fully convincing evidence?

Gut microbiota regulates the host's immune system. Microorganisms and their compounds can co-exist peacefully with the immune system and coordinate its function and regulation. Some microbial clusters may be harmful and others helpful in the respective negative or positive balance of the immune network. These insights have revealed important mechanisms for understanding and treating autoimmune and inflammatory diseases. This Editorial aims to clarify the role of specific genus of gut microbiota, such as Prevotella, in influencing the pathogenesis of Rheumatoid Arthritis (RA).