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Immunisation

(Science: immunology) a process that increases an organisms reaction to antigen and therefore improves its ability to resist or overcome infection.

(Science: technique) a technique used to induce immune resistance to a specific disease in humans (or other mammals) by exposing the individual to an antigen in order to raise antibodies to that antigen. The act of making immune (especially by inoculation).The artificial administering of an antigen into an organism, usually killed or severely weakened so that the immune systems can develop antibodies to that antigen without risk of infection spreading.