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A 23 yo man is brought to ED with sudden high fever, severe dyspnea and malaise. He has history of IV drug use. One hour later he develops progressive respiratory distress and supplemental oxygen is provided. His CD4 cell count is 73. Chest x ray shows bilateral diffuse fine granula appearing interstitial opacification. 1. What test is most appropriate for confirming identity of most likely causal agent and why?

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The General Principles section of the USMLE covers these topics:
Biochemistry
Genetics
Microbiology
Pathology
Pharmacology


1. A 23 yo man is brought to ED with sudden high fever, severe dyspnea and malaise. He has history of IV drug use. One hour later he develops progressive respiratory distress and supplemental oxygen is provided. His CD4 cell count is 73. Chest x ray shows bilateral diffuse fine granula appearing interstitial opacification. 1. What test is most appropriate for confirming identity of most likely causal agent and why?





 
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