Table 3

Diagnostic criteria for reactive arthritis

Major criteria(1) Arthritis with 2 of 3 of the following findings
- Asymmetric
- Monoarthritis or oligoarthritis
- Lower limb involvement
(2) Preceding symptomatic infection with 1 or 2 of the following findings:
- Enteritis (defined as diarrhoea for at least 1 day, and 3 days to 6 weeks before the onset of arthritis)
- Urethritis (dysuria or discharge for at least 1 day, 3 days to 6 weeks before the onset of arthritis)
Minor criteriaAt least one of the following:
(1) Evidence of triggering infection:
- Positive urine ligase reaction or urethral/cervical swab for Chlamydia trachomatis
- Positive stool culture for enteric pathogens associated with reactive arthritis
(2) Evidence of persistent synovial infection (positive immunohistology or PCR for Chlamydia)