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After an infection memory cells develop and can lead to a rapid response. In this case, the person is said to have immunity.
Immunity is a natural biological process by which a person acquires resistance against a pathogenic microorganism.
Immunological memory refers to the ability of the immune system to recognize specific antigens after a first exposition.
Antigens are specific molecules (or molecular fragments) present in pathogenic microorganisms such as for example, bacteria.
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