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Write a short note on vaccination....

Write a short note on vaccination.

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Vaccination refers to the process of injecting a biological or chemical agent that enhances the immunity of a person against the specific disease. Ir generally involves injection of dead organisms into host organism.
Vaccination is the best preventive measure against any disease. A number of specific vaccines are given against many disease, e-g. polio vaccine, diphtheria vaccine, etc.
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