system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
A 24-year-old man presents with cellulitis two days after he is bitten by his cat. What is the most likely dominant organism involved in the infection?
assistant
The correct answer is  Pasteurella multocida is a dominant organism in the cat's mouth. Choice A, Baonella, is the causative agent of cat scratch fever and is less common in bites. Choice B, Calymmatobacterium, causes a sexually transmitted infection, and Toxoplasma (choice D) is associated with cats but transmitted by their faeces, not bites.