Which of the following characteristics is the distinguishing feature of type IV hypersensitivity?

It is cell mediated.

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It takes two or three days to develop.

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It is a humoral response.

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Both A and B

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Solution

The correct option is D Both A and B
Type IV hypersensitivity is also called delayed-type hypersensitivity as symptoms develop 2-3 days after the allergic interaction. It is a type of cell-mediated response unlike other types of hypersensitivities that are antibody mediated. Thus the correct answer is option D.

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