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A 60 year old man abruptly develps temp of 104.2, shakes, severe headache, muscle pain. He initially had dry insignificant cough but over next few days he developed marked SOB that necessitated assisted ventilation. Bronchoalveolar lavage is performed. Gram stain of lavage fluid shows live gram negative rods both in macrophges and free in fluid. Culture of lavage fluid on buffered charcoal yeast extract shwos growth of predominant organism. 1. What is most likely causal organism and why?

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


1. A 60 year old man abruptly develps temp of 104.2, shakes, severe headache, muscle pain. He initially had dry insignificant cough but over next few days he developed marked SOB that necessitated assisted ventilation. Bronchoalveolar lavage is performed. Gram stain of lavage fluid shows live gram negative rods both in macrophges and free in fluid. Culture of lavage fluid on buffered charcoal yeast extract shwos growth of predominant organism. 1. What is most likely causal organism and why?





 
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