Medical & Surgical Nursing Questions and Answers Body Defense Mechanism 

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There is mainly 4 types of hypersensitivity reactions Type 1 (allergic) hypersensitivity : mediated by IgE , within 2 - 30 minutes will appear Type ll hypersensitivity: Antibodies mediated cytotoxic hypersensitivity . Appear 5-8 hrs Type lll: Immune complex mediated, may appear 2-8 hrs Type lV or delayed hypersensitivity: Cell mediated ( T- cell) hypersensitivity, appear 24 -72 hrs Eg:- graft rejection, contact dermatitis, tuberculin reactions

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