Asthma USMLE Step 1 Practice Question
A 20-year-old college student living in a dormitory presents with a 10-day history of dry cough, malaise, and headache. Vital signs show temperature 38.2°C, heart rate 92 bpm, respiratory rate 18/min, blood pressure 118/76 mmHg, and SpO2 98% on room air. Chest radiograph demonstrates diffuse patchy interstitial infiltrates disproportionate to mild clinical findings. Laboratory studies reveal elevated LDH at 520 U/L. He denies wheezing or dyspnea. Which of the following additional findings is most likely?
Answer choices
- ABroad based budding yeast on silver stain
- BCold agglutinin mediated hemolysisCorrect answer
- CPositive urinary Legionella antigen
- DNecrotizing cavitary pneumonia after influenza
- ECurrant jelly sputum
- FPositive PCR for Mycobacterium tuberculosis from sputum culture
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