A Case of Pneumonia Caused by Pasteurella multocida in an Immunocompetent Indian Male

Area of Science:

• Medical Microbiology
• Infectious Diseases
• Pulmonology

Background:

• Pasteurella multocida is a zoonotic bacterium frequently associated with cutaneous and soft-tissue infections.
• Primary pulmonary infections by P. multocida typically arise from inhaling contaminated respiratory droplets from pets, particularly cats and dogs.
• These infections are more prevalent in elderly individuals with pre-existing pulmonary conditions like chronic obstructive pulmonary disease (COPD) and bronchiectasis.

Observation:

• A case of Pasteurella multocida pneumonia occurred in an Indian zookeeper who owned a pet dog.
• The zookeeper had no history of underlying lung pathology or significant comorbidities.
• The clinical presentation mimicked common bacterial and viral respiratory infections.

Findings:

• This case demonstrates that Pasteurella multocida can cause pneumonia in immunocompetent individuals without predisposing lung disease.
• The clinical manifestations of P. multocida pneumonia can be varied, ranging from mild respiratory symptoms to severe illness.
• Diagnostic challenges arise due to the non-specific nature of symptoms, which overlap with other common respiratory pathogens.

Implications:

• Highlights the potential for zoonotic transmission of Pasteurella multocida to cause severe respiratory illness in humans.
• Underscores the critical need for detailed patient history, including pet ownership and exposure, in diagnosing respiratory infections.
• Emphasizes the importance of comprehensive laboratory investigations to differentiate P. multocida pneumonia from other infections and guide appropriate treatment.