Reactive arthritis due to Chlamydia psittaci associated with HLA-B27 genotype

To the Editor: We report a case of reactive arthritis with an unusual cause in a previously well 47-year-old male landscape gardener. The patient presented with acute onset of left ankle arthritis. He had a 10-day history of a productive cough associated with mild fever, back pain and arthralgias. His temperature was 37.7°C and occasional crackles were audible at the lung bases. His left ankle was tender, with decreased range of movement. The provisional diagnosis was atypical pneumonia with reactive arthritis.