The basic principle of immunization is that on administration of vaccine, the body starts developing antibodies against it such that person is protected form disease. Body remembers the infectious agents and memory cells are formed which can immediately produce antibodies on further exposure to the infectious agents.
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Immunization in simple words ;the principal is when a person comes and beat a unknown in return he can't as he is not alert but when the same person comes again he will be very alert
it means same in our system when vaccine is given the body produces antibodies when next time the real pathogenic organisms enter our body functions well