A 10-Year-Old Boy Is Brought to the Emergency Department Due

A 10-year-old boy is brought to the emergency department due to shortness of breath and palpitations for the past day.  He also has associated fever and fatigue.  Vital signs indicate tachypnea, tachycardia, and hypotension.  On cardiac auscultation, the patient has a new holosystolic murmur.  He is admitted to the hospital for further workup and management.  A cardiac biopsy is performed due to decompensation and an unclear diagnosis.  Light microscopy of the tissue specimen is shown in the image below. Which of the following most likely preceded development of this patient's current condition?

A) Antibiotic exposure
B) Bacterial infection
C) Chemotherapy
D) Genetic mutation
E) Travel to South America
F) Viral infection

Correct Answer:

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