Why do we not fall sick every time?
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The reason why a person does not fall sick everytime is because due to the action of our immune system. The immune system acts as a shield towards the diseases thereby protecting us from the disease.
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The immune system recognises the virus and produces a substance that neutralises the uninvited guest. The process goes on continuously without us being aware of it. If this first immune reaction is not sufficient to suppress the virus, the infection establishes itself in the body.
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