title: Potential triggering infections of reactive arthritis.
abstract: OBJECTIVE
  The aim of the study was to investigate possible triggering infections causing reactive arthritis (ReA) of urogenital origin.
  
  
  METHODS
  One hundred and twenty ReA patients, 85 control group patients with other arthritides (61 with rheumatoid arthritis, 13 with osteoarthritis, and 11 with microcrystal arthritis), and 52 healthy persons were tested for urogenital tract inflammation and several infectious agents. Ligase chain reaction was used for detection of Chlamydia trachomatis (CT). Genital mycoplasmas Ureaplasma urealyticum (Uu) and Mycoplasma hominis (Mh) were tested using the Mycoplasma Duo Test (MDT). Only titres greater than 10(4) CCU/mL were accepted as pathogenecity threshold levels for Uu.
  
  
  RESULTS
  Inflammation of the urogenital tract (most frequently urethritis in men and cervicitis in women) was found in 95% of patients with acute ReA. Possible causative pathogens were identified in 58% of ReA patients. CT was found in 29%, Uu in 21%, and Mh in 8% of patients with ReA. While CT and Uu were found more often in HLA-B27-positive than in HLA-B27-negative patients, this was statistically proved only for CT. In ReA males Uu was found four times more frequently than in men with other arthritides.
  
  
  CONCLUSIONS
  In active ReA of urogenital origin, inflammation of the urogenital tract is found in the majority of patients. Although CT is the main microorganism associated with urethritis in men and cervicitis in women, mycoplasmas, especially Uu, may be possible aetiological factors for ReA.
authors.affiliation: Vilnius University, Insitutute of Experimental and Clinical Medicine, Vilnius, Lithuania. irena.butrimiene@santa.lt
authors.forename: I
authors.initials: I
authors.lastname: Butrimiene
authors.forename: J
authors.initials: J
authors.lastname: Ranceva
authors.forename: A
authors.initials: A
authors.lastname: Griskevicius
mesh_terms: D000328:Adult; D016918:Arthritis, Reactive / Q000382:microbiology*; D002692:Chlamydia trachomatis / Q000302:isolation & purification; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D019535:Mycoplasma hominis / Q000302:isolation & purification; D000091402:Prohibitins; D012749:Sexually Transmitted Diseases / Q000382:microbiology*; D016990:Ureaplasma urealyticum / Q000302:isolation & purification; D014552:Urinary Tract Infections / Q000382:microbiology*