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Rheumatology 2002; 41: 1017-1020
© 2002 British Society for Rheumatology

Original papers

Importance of species-specific antigens in the serodiagnosis of Chlamydia trachomatis reactive arthritis

S. Bas, S. Genevay, M.-C. Schenkel and T. L. Vischer

Division of Rheumatology, Department of Internal Medicine, University Hospital, Geneva, Switzerland

Objectives. To determine the most sensitive and specific method of anti-Chlamydia antibody measurement for the serodiagnosis of Chlamydia trachomatis reactive arthritis.

Methods. Immunoblotting, enzyme-linked immunosorbent assays using six synthetic peptides or recombinant antigens and a microimmunofluorescence test were used to determine the presence of IgG, IgM and IgA in serum samples from 17 patients with C. trachomatis reactive arthritis. Twenty patients with other inflammatory arthropathies without evidence of urogenital C. trachomatis infection were used as controls.

Results. The best association of sensitivity (76%) and specificity (85%) was obtained when IgG and/or IgA reactivity to two species-specific antigens was determined. These antigens were synthetic peptides, derived from species-specific epitopes in the variable domain IV of the major outer membrane protein (MOMP) (Labsystems, Finland) and recombinant polypeptide encoded by open reading frame 3 of the plasmid (pgp3).

Conclusions. IgG and/or IgA anti-MOMP-derived peptides and anti-pgp3 could be useful for the diagnosis of probable C. trachomatis reactive arthritis.

KEY WORDS: Chlamydia trachomatis, Sexually acquired reactive arthritis, Antibodies, MOMP, Pgp3.

Correspondence to: S. Bas, Research Laboratory, Division of Rheumatology, University Hospital, 1211 Geneva 14, Switzerland.


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