Pneumonia USMLE Step 1 Practice Question
A 35-year-old construction worker in Arizona presents with fever (38.9°C), productive cough, and pleuritic chest pain. Examination reveals erythema nodosum on bilateral shins. Vital signs show BP 128/82, HR 98, RR 20, SpO2 98% on room air. Chest radiograph demonstrates patchy alveolar infiltrates with hilar lymphadenopathy. Laboratory studies reveal elevated ACE level at 68 U/L. He denies hemoptysis. Which organism most likely explains this clinical presentation?
Answer choices
- ACoccidioides immitisCorrect answer
- BHistoplasma capsulatum
- CBlastomyces dermatitidis
- DStreptococcus pneumoniae
- ELegionella pneumophila
- FAspergillus fumigatus
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