Unformatted text preview: 3. Type III (immune complex) reactions---antigen-antibody complexes are deposited in organs and cause inflammatory damage. Complement becomes activated and this plus attraction and release of enzymes from neutrophils results in damage or destruction of the cells in the area. Glomerulonephritis is an example. 4. Type IV (cell-mediated) reactions—also called delayed hypersensitivity reactions. T cells are involved in this type instead of antibodies. T cells become activated, release destructive cytokines, and attract macrophages to the area. Cytotoxic T cells may also appear. This results in damage to cells in the affected area. Contact dermatitis and poison ivy are examples. The skin test for tuberculosis is based on this type of reaction....
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- Fall '09
- Contact dermatitis, platelet. Complement, type blood cells