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A 58-year-old man presents with history of recurrent rashes that became severe in the last week. The rashes were erythematous with a fine, sandpaper-like texture. He also reports having a fever and symptoms of a sore throat two weeks prior to the rash. Examination reveals a 'strawberry tongue'. Based on the history and physical examination, what mechanism is the most likely cause of this patient's symptoms?
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E