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Immunization is a way of preventing a person from getting a disease. This is done by making the person's body come into contact with a bit of the disease so that the body learns how to fight it. The body's ability to fight off a disease is called its immune system.
The material is known as an immunogen. Immunization is the same as inoculation and vaccination because inoculation and vaccination use an infecting agent (something that infects) in the same way that immunization does.
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