IgG antibodies to P. gingivalis, P. intermedia, A.actinomycetemcomitans, and Eikenella corrodens;laboratory variables: anti-CCP antibodies and RF;clinical RA assessment: DAS28-CRP;PD assessments: number of teeth present, probing depth, CAL, BOP, supragingival plaque accumulation. This evidence concerns the gene CRP and rheumatoid arthritis.