Immune system has memory component. How does man make use of it to control disease?

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When the pathogen (microorganism) enters in our body for the first time, our body produces immune response of low intensity called primary response. The primary immune response is carried out with the help of two special types of lymphocytes present in our blood i.e B- lymphocytes and T- lymphocytes. The B- lymphocytes produce the army of proteins called antibodies which kill the pathogen. Some of the B cells called memory B cells and antibodies remain stored as memory in our blood. If the person is attacked by the same microorganism again then the B cells and antibodies already synthesised for this microorganism will remember that microorganism and will produce a much stronger secondary immune response to fight against microorganism and hence protects body from any disease. 

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After an infection has cleared, a small number of B and T cells persist in the blood with memory of the virus, allowing them to activate and destroy viruses more quickly next time they enter the body
This is known as immunity. It doesn't really matter if the infection you're fighting is bacterial, viral or a parasite — the general process is the same.
This is also how vaccination works. When you have a vaccination it's like inserting a "false memory" into your immune system.
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