Which disease is an acute type of bacterial pneumonia?

• A. Upper Respiratory Infection (URI)
• B. Legionnaire's Disease
• C. SIDS
• D. TB

Answer: (B)

Legionnaires' disease is an acute bacterial pneumonia caused by Legionella bacteria, typically presenting with a sudden onset of fever, cough, shortness of breath, and chest findings consistent with pneumonia. It often results from inhaling aerosolized water from contaminated sources like cooling towers or hot water systems, which helps explain why it stands out from other respiratory infections.

The upper respiratory infection involves the nose and throat and doesn’t usually progress to pneumonia. SIDS is not an infection at all but a sudden infant death syndrome. Tuberculosis is a chronic mycobacterial infection that tends to have a slower, more indolent course and isn’t described as an acute pneumonia.