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Prevotella copri (Pc), a gut commensal, has been reported to be an immune relevant organism in individuals with rheumatoid arthritis (RA). Our goal was to evaluate anti-Pc antibody responses in our participant cohorts and determine when in the natural history of RA such responses develop. Serum levels of IgA and IgG anti-Pc-p27, an immunogenic Pc protein, were analyzed in study participants at-risk for the development of RA, those who transitioned to RA, in those with early RA ( one year of disease), and in those with established R