WBR0876

Author	[[PageAuthor::Rim Halaby, M.D. [1]]]
Exam Type	ExamType::USMLE Step 1
Main Category	MainCategory::Microbiology
Sub Category	SubCategory::Infectious Disease
Prompt	[[Prompt::A 75 year old man with history of severe emphysema maintained on home oxygen is admitted to the intensive care unit for desaturation on 100% FiO2. On admission, his heart rate is 133 bpm, blood pressure 80/53 mmHg, and temperature 39.1 C. Despite efforts, the patient dies shortly after admission. Postmortem examination reveals several black necrotic lesions with a surrounding erythematous edge most prominent on the lower extremities. Blood cultures withdrawn on admission, reveal growth of rod shaped gram-negative organisms. What is the most likely organism involved in the patient's presentation?]]
Answer A	AnswerA::''Escherichia coli''
Answer A Explanation	AnswerAExp::''Escherichia coli'' sepsis is not associated with ecthyema gangrenosum.
Answer B	AnswerB::''Klebsiella pneumoniae''
Answer B Explanation	AnswerBExp::''Klebsiella pneumoniae'' sepsis is not associated with ecthyema gangrenosum.
Answer C	AnswerC::''Citrobacter freundii''
Answer C Explanation	AnswerCExp::''Citrobacter freundii'' sepsis is not associated with ecthyema gangrenosum.
Answer D	AnswerD::''Pseudomonas aeruginosa''
Answer D Explanation	AnswerDExp::''Pseudomonas aeruginosa'' sepsis is the classical cause for ecthyema gangrenosum.
Answer E	AnswerE::''Proteus mirabilis''
Answer E Explanation	AnswerEExp::''Proteus mirabilis'' sepsis is not associated with ecthyema gangrenosum.
Right Answer	RightAnswer::D
Explanation	[[Explanation:: Educational Objective: References: ]]
Approved	Approved::No
Keyword	WBRKeyword::Pseudomonas aeruginosa, WBRKeyword::ecthyema, WBRKeyword::sepsis
Linked Question	Linked::
Order in Linked Questions	LinkedOrder::