Sunday, January 16, 2022

What is an antigen

Antigen is an extraneous foreign particle which may be a protien or dust or pollen grain or smoke or any other particulate matter, which when enter in to Human body elicit sesitisation of the cellular, humoral immunity.

It causes alterations in the cellular physiology by disturbing it's own mechanism by triggering biological signalling system thereby causing sickness or elicit allergic reaction or anaphylaxis making individual suffer with symptoms arisen from sensitisation with causative agent the antigen.

Therefore antigenicity can be present in small part of a bacterial, viral, fungal protien, or over an bacterial cell or viral cell there are number of protien portion which exhibit antigenic activity.

A protien when combined with immunoglobulin elicit allergic reaction are called as hapten.

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