This question is most asked and many students confuse in understanding the main difference between antigen and antibody.
Let’s start…
Any substance which an internal part of the ( Autoimmune disease) or external substance, which stimulates the immunity of the host call antigen in the immunological term.
When an antigen enters the body, the immune system detects it as a reign body. as a response to that antigen. The immune system produces a specific substance for its defense. this substance is called Antigen.
Note: Each AG has a specific AB
There is a difference between Hepatitis b antigen and antibody is that the antigen is a foreign substance that enters the body in some way. The immune system of the host detects it as a pathogen and starts producing a specific substance against that antigen for its protection to that pathogen.
In this case, Hepatitis b HBV, which is a DNA virus. When this virus enters the body, its surface protein act as an antigen. This antigen stimulates the immune system. As a result, antibody produces in the body.
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