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Review Question - QID 212413

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QID 212413 (Type "212413" in App Search)
A 29-year-old man presents to the emergency department with chest pain and fatigue for the past week. The patient is homeless and his medical history is not known. His temperature is 103°F (39.4°C), blood pressure is 97/58 mmHg, pulse is 140/min, respirations are 25/min, and oxygen saturation is 95% on room air. Physical exam is notable for scars in the antecubital fossa and a murmur over the left sternal border. The patient is admitted to the intensive care unit and is treated appropriately. On day 3 of his hospital stay, the patient presents with right-sided weakness in his arm and leg and dysarthric speech. Which of the following is the most likely etiology of his current symptoms?