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Microbiology Practice MCQs

Browse 11,603 high-yield clinical questions in Microbiology. Includes detailed explanations, options, and topic tags.

#8462 General

A 35 year old man develops hemiparesis, ataxia, homonymous hemianopia, and cognitive deterioration. An MRI of the brain demonstrates widespread areas of abnormal T2 signal in the white matter. An electroencephalogram is remarkable for diffuse slowing over both cerebral hemispheres. Brain biopsy reveals demyelination with abnormal giant oligodendrocytes, some of which contain eosinophilic inclusions. This patient's condition is most closely related to which of the following diseases?

#8468 General

A 47 year old man with a history of sickle cell disease has had numerous hospitalizations requiring the placement of intravenous lines. The patient has poor peripheral venous access, and a catheter is placed in the right subclan vein. The patient subsequently develops right arm discomfo and swelling and a temperature of 40.1 degrees C with chills. Multiple blood cultures are taken, and gram-positive cocci are isolated. The organism is catalase positive and grows on mannitol salt agar, but does not turn the agar yellow; the colonies are gamma-hemolytic on a sheep blood agar plate. Which of the following organisms is the most likely cause of this patient's symptoms?

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