MCQ – 89134


A 36-year-old male presents with fever, dry cough, and dyspnea for two weeks. He has a history of HIV, and he does not take any medications. Temperature is 38.6 C (101.5 F), the pulse is 90/min, blood pressure is 130/80 mm of Hg, and respirations are 28/min. Pulse oximetry shows an oxygen saturation of 84%. Chest auscultation reveals diffuse crackles in both lungs. Serum lactate dehydrogenase is 350 U/L. Chest x-ray shows bilateral diffuse interstitial infiltrates. Gram staining and culture of the sputum do not reveal any organisms. Which of the following is the next best step?

A. Bronchoscopy with bronchoalveolar lavage


Examination of stool or respiratory excretion for eggs or worms


Acid-fast stain of stool


Urine antigen test

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