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Organism immunized in opposition to potential infections

Explain that how can an organism which once undergoes contact along with an antigen be immunized in opposition to potential infections by similar agent?

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This phenomenon is known as immune memory. Whenever an antigen establishes contact for the very first time with cells of humoral immune system, B lymphocytes which are producers of particular immunoglobulins in opposition to that antigen multiply and in days synthesize their antibodies. This is known as initial response. Some of these particular B lymphocytes stay in the circulation for a extended time, many times through the entire life of the particular, and they become the memory cells of the immune system. Whenever the Human body is exposed in the future to that particular antigen again, the production of antibodies will be quicker and more intense as the immune system is by now prepared to react in opposition to that antigen. This is known as the secondary response.

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