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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