Table 5 Clinical and laboratory features among 54 subjects diagnosed with reactive arthritis (ReA)
Clinical featurenPercentage* or range
Pain on day of examination:
    Moderate4685
    No pain713
    Severe12
Mean pain intensity in week before examination51–10
Saw a health care provider for joint or back symptoms2444
Took NSAID3157
Took narcotics713
Took prednisone12
Took antibiotic for acute enteric illness4689
ReA symptoms interfered with usual activities2750
    Person days of activities missed5441–90
Missed work because of ReA symptoms1950†
    Person days of work missed640–14
Physical examination findings:
Enthesitis4888.8
    Mean number of tender entheses61–22
    Mander Enthesis Index121–64
Arthritis1019
    Mean number of swollen joints31–7
Inflammatory back pain+enthesitis or arthritis2648
Inflammatory back pain only36
Conjunctivitis36
Oral ulcer24
Laboratory test results:
HLA-B27 positive612‡
Elevated ESR (>30 mm/hr)612‡
Elevated CRP (>1.0 mg/dl)821‡
Infecting organism:¶
    Campylobacter (n = 49)3367
    Salmonella (n = 24)1771
    Shigella (n = 4)250
    Escherichia coli O157 (n = 4)125
    Yersinia (n = 1)1100
  • *Total >100% because many had more than one finding. †38/54 subjects were employed > 20 h/week. ‡HLA-B27 not determined for 2 patients; ESR not determined for 3 patients; CRP not determined for 15 patients. ¶Percentages represent percentage of total examined for each pathogen.

  • CRP, C-reactive protein. ESR, erythrocyte sedimentation rate; HLA, human leukocyte antigen; NSAID, non-steroidal anti-inflammatory drug.