Type IV hypersensitivity (cell-mediated)

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What is type IV hypersensitivity? Type IV hypersensitivity is a T-cell-mediated hypersensitivity, meaning the inflammation and potential tissue damage is caused by either T helper cells (CD4+) or cytotoxic T cells (CD8+). This video covers the pathophysiology, symptoms, and several examples, including contact dermatitis as with poison ivy, as well as several other systemic diseases.

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