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Journal Article
Research Support, Non-U.S. Gov't
Review
Bacterial antigens in reactive arthritis and spondarthritis. Rational use of laboratory testing in diagnosis and follow-up.
Baillière's Clinical Rheumatology 1998 November
An aetiological diagnosis of reactive arthritis is based on the demonstration of recent or ongoing infection with the causative bacterium. This may be done by serological demonstration of antibacterial antibodies, demonstration of the causative microorganism at an extra-articular site or by identification of bacterial nucleic acids or antigens in joint material from patients with aseptic arthritis. The finding of elevated titres of bacteria-specific IgG- and IgA-class antibodies may indicate recent or persistent infection, but has some limitations due to the prevalence of such antibodies among apparently healthy individuals and the persistence of such antibodies after the infection. While Chlamydia can be demonstrated in urogenital specimens in at least one-third of patients with Chlamydia-induced arthritis, the triggering microorganisms are usually no longer detectable in post-dysenteric reactive arthritides. Assays involving molecular amplifications have been successfully used to demonstrate bacterial nucleic acids in joint specimens from patients with reactive arthritis. In addition, bacterial antigens have been detected by immunofluorescence tests. Even though examination of synovial fluid and synovial membrane specimens for bacterial DNA by the polymerase chain reaction is increasingly used to diagnose reactive arthritis, such assays have not been standardized and are not generally available. While some problems remain, these techniques will facilitate the exact diagnosis of reactive arthritides in the near future.
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