Immunization is the process of making a person or animal protected against a disease, usually by giving a vaccine. It trains the immune system to recognize and fight specific germs.
From "immunize" (to make immune) plus the noun suffix "-ation." "Immunize" itself comes from Latin "immunis" (exempt), reflecting the idea of gaining exemption from disease.
Immunization works by safely showing your body a "wanted poster" of a germ, so your defenses learn what to attack later. Even though it feels like nothing much at the moment of the shot, it can quietly protect you for years or even a lifetime.
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