Immunizations cause the person to have a mild case of the disease so that they won't have a severe case later in life.

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Immunizations work by introducing a small, harmless piece of the infectious agent (like a protein or dead virus) to the body in order to trigger an immune response. This response allows the body to develop immunity to the actual disease, without causing a mild or severe case of the disease in the person getting vaccinated.

Immunizations Cause the Person to Have a Mild Case of the Disease