ALLERGY::
Allergy is one of the consequence of immunological response involving antigen antibody interaction it is rather a side effect of immunity and may be defined as increased reactivity to foreign material (or antigen) above normal hence it is also called as hypersensitivity Allergy or hypersensitivity involves following steps:
1.Appearance of antigen
2. Synthesis of antibodies that are specific to antigen.
3. Antigen antibody reaction causing various clinical menifestations such as anaphylaxis or shock blood-dyscrasias (destruction of blood cells) etc
Types of Allergy::
Like immunity there are two types of allergy humoral and cell mediated in humoral type of reaction antigen reacts with antibodies whereas in cell-mediated type of allergy antigen acts through lymphoid cells
Humoral type of allergy may be further subclassified into three types Type I or Anaphylaxis Type II or Cytotoxic and Type III or toxic complex reaction Cell-mediated type is also known as Type IV.Type I is immediate type or acute reaction Type II and Type III are sub-acute or delayed reactions Type IV is of chronic or late reaction
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