Objectives: To determine whether Mycobacterium tuberculosis DNA can be detected in synovial fluid of patients with rheumatoid arthritis (RA).
Methods: The polymerase chain reaction was applied to cellular components of synovial fluid.
Results: No evidence of M tuberculosis DNA was found in synovial fluid from 31 patients with RA and 13 control patients.
Conclusion: The findings do not support a role for persistent M tuberculosis infection in the pathogenesis of RA.