Classification of hypersensitivity reactions:
Hypersensitivity reactions can be widely categorized into immediate and delayed hypersensitivity reactions.
Immediate hypersensitivity reactions are as shown below:
1. Type I hypersensitivity-Anaphylaxsis (i.e., Reaginic)
2. Type II hypersensitivity- cytolytic and cytotoxic reactions
3. Type III hypersensitivity-Immune complex disease
Delayed hypersensitivity reaction is as well called.
4. Type IV hypersensitivity or Delayed hypersensitivity.Such hypersensitivity reactions are categorized based on the time needed for a sensitized host to build up clinical reactions once he is exposed to an antigen.
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