Asthma USMLE Step 1 Practice Question
A 55-year-old man presents 3 days after attending a large hotel convention with high fever (39.2°C), productive cough, diarrhea, confusion, and progressive shortness of breath. Vital signs: BP 118/76, HR 108, RR 22, SpO2 92% on room air. Laboratory studies reveal hyponatremia (128 mEq/L) and chest X-ray shows patchy lower lobe infiltrates. Gram stain of sputum reveals no organisms. He denies recent antibiotic use. Which organism is most likely responsible?
Answer choices
- AMycoplasma pneumoniae
- BLegionella pneumophilaCorrect answer
- CStreptococcus pneumoniae
- DKlebsiella pneumoniae
- EChlamydophila psittaci
- FCoxiella burnetii
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