An antigen is an antibody generator which is introduced to the body to provoke a reaction. When appropriate an autoantigen is introduced for specific autoimmune issues.
no, with a weakend immune system they are more likely to become sick. *edit: I don't know the answer to this question but I do know that having an autoimmune disease does not necessarily mean that you have a weakend [sic] immune system. In fact, autoimmune disorders are classified as a type of hypersensitivity, i.e. to some kind of self antigen.
An antigen is any large molecule or organism which triggers a specific (rather than generalised) immune response against itself within the host body. When the body detects an antigen, the adaptive immune system produces B & T lymphocytes with antigen receptors on their surface of specific shape to bind with, and destroy that antigen; the process takes a few days, but once made, antigen receptors for that pathogen remain in the body ready to mount a much faster attack should the same antigen be encountered in the future. Some antigens only trigger a response in some people - for instance, pollen causes hayfever (which is an immune response) in some people, but not in others; in autoimmune disorders, the body mistakes normal body cells for antigens, and attacks them in - in multiple sclerosis, myelin is seen as an antigen, and is destroyed. In vaccinations, dead or weakened antigens are introduced into the body, which then produces lymphocytes to deal with it & any future invasions by that antigen, giving the person immunity.
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