Arthritis has not previously been reported as a complication in adult patients with chickenpox. In pediatric patients, the arthritis that complicates chickenpox is most commonly aseptic but does rarely result from bacterial infection. We report the case of a 21-year-old man who developed acute monoarticular septic arthritis due to Lancefield Group A β-hemolytic streptococci. Despite the more common viral cause of arthritis in pediatric patients, physicians should not attribute arthritis associated with varicella in adults to a viral cause without diagnostic arthrocentesis.
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