What is the word of antigen

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what is the word of antigen means?

A substance that triggers an immune response. It may be a bacterium or virus entering the body; the body begins to "generate" particles and special substances against it to eliminate it for the purpose of protecting the body.
if you have a specific question about antigen then ask me as there is this is widly used in medical practice.
in general, antigen trigger immune response
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Dear customer 
The treament depend upon the type of antigen (bacteria-vairus or Others 
Stay well