Erysipelothrix rhusiopathiae-induced septic arthritis in a calf.

A 14-week-old Holstein heifer with a 48-hour history of left tarsocrural joint effusion was referred for evaluation when lameness developed 24 hours after needle aspiration was attempted at the farm. Results of synovial fluid analysis were compatible with diagnosis of septic arthritis, and bacteriologic culture of the fluid yielded Erysipelothrix rhusiopathiae. The calf responded to tarsocrural joint lavage and penicillin G administration.