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Hypersensitivity Reactions

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Hypersensitivity reactions occur when the immune system overreacts and damages the body. There are two types of reactions: immediate and delayed. There are also several subtypes, including IgE-mediated, cytotoxic, immune complex-mediated, and stimulatory.

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Hypersensitivity Reactions PPT Summary

  1. Hypersensitivity reactions can be either humoral or cell-mediated.
  2. There are five types of hypersensitivity reactions: type I (IgE-mediated), type II (antibody-mediated cytotoxic), type III (immune complex-mediated), type IV (delayed type hypersensitivity), and type V (stimulatory type).
  3. Mast cell degranulation plays a crucial role in type I hypersensitivity reactions.
  4. Systemic anaphylaxis is a severe and potentially fatal hypersensitivity reaction that occurs within minutes of allergen exposure.
  5. Hypersensitivity reactions can be detected through skin testing and antibody determination.


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