COPD USMLE Step 1 Practice Question
A 64-year-old man with COPD presents with fever (39.2°C), cough, confusion, and diarrhea after returning from a hotel conference. Vital signs show HR 104/min, BP 118/72 mmHg, RR 22/min, SpO2 94% on room air. Chest X-ray reveals patchy left lower lobe infiltrates. Serum sodium is 128 mEq/L. He denies hemoptysis. He takes albuterol and tiotropium daily. Which organism is most likely responsible for this clinical presentation?
Answer choices
- AHaemophilus ducreyi
- BChlamydia psittaci
- CMycoplasma pneumoniae
- DLegionella pneumophilaCorrect answer
- EStreptococcus pyogenes
- FCoxiella burnetii
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