Micro & Immunology · single question
What type of hypersensitivity is contact dermatitis?
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Correct answer: D. Type IV
Contact dermatitis is a classic Type IV (delayed-type) hypersensitivity mediated by T-cells, not antibodies. Sensitized T-cells respond to antigen (latex, nickel, etc.) 48–72 hours after exposure. Type I = immediate IgE-mediated. Type II = cytotoxic antibody. Type III = immune complex deposition. Type IV = T-cell mediated, delayed (24-72 hrs).
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