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The case highlights an unusual instance of pneumonia due to a rare bacterial infection in a specific patient demographic.

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March 14, 2026

Community-Acquired Pneumonia Due to Pasteurella multocida

Key Points

The case highlights an unusual instance of pneumonia due to a rare bacterial infection in a specific patient demographic.
Detailed a case report of an elderly man with a history of cat ownership
Identified the causative organism as Pasteurella multocida
Described the circumstances leading to bacterial pneumonia
Confirmed the diagnosis of community-acquired pneumonia from P. multocida
Noted the patient's history of owning multiple cats as a contributing factor
Demonstrated the rarity of such infections in the presented population

Abstract

Most cases of community-acquired pneumonia result from infection with predictable common pathogens. However, rare patients develop pneumonia from unusual bacterial species such as Pasteurella multocida, a Gram-negative oral commensal of most dogs and cats. The majority of P. multocida infections involve skin and soft tissue and complicate a bite or scratch. I report the case of an elderly man who owned 16 cats and developed bacteremic pneumonia with P. multocida.

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