5 . . What is theory behind immunisation
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Immunization is the process whereby a person is made immune or resistant to an infectious disease, typically by the administration of a vaccine. Vaccines stimulate the body's own immune system to protect the person against subsequent infection or disease.
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Goodrum: Vaccines help the body “learn” to recognize a pathogen before an infection. That way, you have a protective immune response ready to prevent an infection if you encounter the pathogen. Vaccines provide protective immunity in a number of ways.
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