The 'Arthus reaction' is a localized area of tissue necrosis resulting from acute immune complex vasculitis. This is a classic example of:
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Correct answer: Type III hypersensitivity
The Arthus reaction occurs when antigens are injected into the skin of an individual with pre-existing circulating antibodies. Immune complexes form locally in vessel walls, triggering complement activation and neutrophilic infiltration, leading to fibrinoid necrosis.
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