Question

state principle of immunisation

Answer 1

Immunization can be defined as process by which an individual is made immune or resistant to an infectious disease by administration of an external agent {Vaccine}.
 
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Answer 2

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.