title: Chlamydia trachomatis antibody detection and diagnosis of reactive arthritis.
abstract: OBJECTIVE
  To investigate whether determining the presence of serum or synovial fluid (SF) IgG and IgA of anti-Chlamydia antibodies with two recent commercially available enzyme-linked immunosorbent assays (ELISA) using synthetic peptides or recombinant antigen could be helpful to detect possible Chlamydia trachomatis (CT)-involved disease in rheumatological patients without evidence of urogenital CT infection.
  
  
  METHODS
  The prevalence of such antibodies was determined in samples from patients with well-defined disease, i.e. CT sexually acquired arthritis and from patients with other inflammatory arthropathies unrelated to CT.
  
  
  RESULTS
  When considering IgG and/or IgA anti-MOMP or anti-LPS antibodies, a sensitivity of 100% was obtained for serum and SF samples, but with a low specificity. A sensitivity and a specificity equal or close to 80% were observed for the SF IgG anti-MOMP antibodies.
  
  
  CONCLUSIONS
  Clinically, the most appropriate determination was the SF IgG anti-MOMP antibodies. This commercially available ELISA test could be useful for the diagnosis of probable CT reactive arthritis.
authors.affiliation: Department of Internal Medicine, University Hospital, Geneva, Switzerland.
authors.forename: S
authors.initials: S
authors.lastname: Bas
authors.forename: T L
authors.initials: TL
authors.lastname: Vischer
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000907:Antibodies, Bacterial / Q000032:analysis*; D000942:Antigens, Bacterial / Q000276:immunology; D016918:Arthritis, Reactive / Q000175:diagnosis* / Q000276:immunology / Q000382:microbiology; D001425:Bacterial Outer Membrane Proteins / Q000276:immunology; D002690:Chlamydia Infections / Q000175:diagnosis* / Q000276:immunology / Q000382:microbiology; D002692:Chlamydia trachomatis / Q000276:immunology*; D004797:Enzyme-Linked Immunosorbent Assay; D005069:Evaluation Studies as Topic; D005260:Female; D006801:Humans; D007070:Immunoglobulin A / Q000032:analysis; D007074:Immunoglobulin G / Q000032:analysis; D008297:Male; D008875:Middle Aged; D018272:Porins; D011237:Predictive Value of Tests; D011994:Recombinant Proteins; D013582:Synovial Fluid / Q000276:immunology / Q000382:microbiology
chemical_list: D000907:Antibodies, Bacterial; D000942:Antigens, Bacterial; D001425:Bacterial Outer Membrane Proteins; D007070:Immunoglobulin A; D007074:Immunoglobulin G; D018272:Porins; D011994:Recombinant Proteins; C071677:omp1 protein, Chlamydia trachomatis