Question

Why the effect of vaccine found for several days and the disease will not likely to occur

Answer 1

Vaccine contains dead or weakened microbes. When this is injected into the body, the body makes antibodies to fight these microbes. In this process it also creates memory cells. When this microbes enter some other time, these memory cells send signals to make the same antibodies to fight them. That is why the effect of vaccine will be there for several days,months or even years and the disease is very less likely to occur.
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