A Case of Polyarticular Pasteurella multocida Septic Arthritis

A 76-year-old man with a history of osteoarthritis presents with right leg erythema and inability to weight-bear and pain in his right shoulder. Synovial fluid cell count of the knee and shoulder showed abundant neutrophils, and cultures of the knee showed growth of Pasteurella multocida. The patient owned four cats with which he had frequent contact, but history and physical examination elicited no evidence of scratches or bites. This case highlights the invasive potential of Pasteurella multocida in an immunocompetent individual and its capacity to cause septic arthritis in the setting of frequent animal contact.

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