Pasteurella multocidais a small Gram-negative bacterium comprising part of the normal gastrointestinal and nasopharyngeal flora of domestic pets, such as dogs and cats. It rarely causes infection in humans. Previous reports ofP multocidacausing prosthetic joint infection have described either haematogenous spread of infection from a distant site through a scratch or bite, or reactivation of infection from a previous injury. We report a case of acute total knee arthroplasty joint infection becoming acutely infected byP multocida. We postulate that the mechanism of infection was direct contamination of the wound as a consequence of the patient being licked by his pet dog. We discuss the potential role played by thromboprophylaxis as a factor contributing to prolonged wound leak.

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