An 8-Year-Old Boy Is Brought to the Office for Rapid

An 8-year-old boy is brought to the office for rapid and irregular movements of his hands for one week.  His parents say that he is also making unintentional "funny faces" and has trouble controlling the volume of his voice.  His temperature is 38.9 C (102 F) .  On physical examination, the boy moves his hands frequently and erratically.  He has a new III/VI systolic murmur and several circular, faintly erythematous lesions on his abdomen.  Which of the following is the most likely mechanism for this patient's condition?

A) Nonspecific T cell receptor activation
B) Cross-reactivity of antibodies against bacterial and host antigens
C) Embolization of an infected thrombus
D) Injury from immune complex deposition
E) Release of an erythrogenic toxin

Correct Answer:

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