Hypersensitivity: Any immune response against a foreign antigen that is exaggerated beyond the norm.
There are four types of hypersensitivity and it's associated diseases or conditions:
- Type I Hypersensitivity
- Allergies: An immediate hypersensitivity response against an antigen.
- Type II Hypersensitivity
- Immune Thrombocytopenic Purpura: Disease resulting when drugs bound to platelets bind antibodies and complement, causing the platelets to lyse.
- Type III Hypersensitivity
- Glomerulonephritis: Deposition of immune complexes in the walls of the glomeruli--networks of minute blood vessels in the kidneys--that may result in kidney failure; typically caused by infection with group A Streptococcus.
- Type IV Hypersensitivity
- Allergic Contact Dermatitis: Type of delayed hypersensitivity reaction in which chemically modified skin proteins trigger a cell-mediated immune response.
*allergic contact dermatitis
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