Review Question - QID 214739

A 23-year-old man presents to the emergency department with chest pain and shortness of breath. This past week he has been sick at home with a fever, sore throat, and malaise. Today, he has chest pain and dyspnea that is exacerbated with minor exertion such as getting up to go to the bathroom. The patient has no significant medical history and takes no prescription medications. He admits to occasionally using "recreational drugs" and last used these substances 1 week ago. His temperature is 104°F (40.0°C), blood pressure is 92/68 mmHg, pulse is 135/min, respirations are 24/min, and oxygen saturation is 99% on room air. Physical exam is notable for an uncomfortable appearing patient, rapid but regular heart rate, and minor bibasilar crackles on lung auscultation. An ECG is performed as seen in Figure A. An initial troponin level is measured at 0.12 ng/dL (normal < 0.01 ng/mL). Which of the following is the most likely etiology of this patient's symptoms?