Question

what is vaccination?what is the principle of vaccination

Answer 1

vaccination is an Antidote for protection from certain viruses an it is use for fighting the viruses it is an security system for our body

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Answer 2

Vaccination is the administration of antigenicmaterial (a vaccine) to stimulate an individual's immune system to develop adaptive immunity to a pathogen. Vaccinescan prevent or ameliorate infectious disease. When a sufficiently large percentage of a population has been vaccinated, herd immunity results.
the principal for that is -:
 the basic function of the immune system is useful in order to understand both how vaccines work and the basis of recommendations for their use. 

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