Sweety suffered from chicken-pox this year. Her grandmother told her that now she would not suffer from this disease again. What are the reasons for such a saying?

When sweety suffered from chicken-pox, antibodies were prepared by her body in response to the action of chicken pox virus. This is an example of active immunity in which body prepares antibodies against the disease causing microbe and store it for a very long period. When the person encounters the same disease again, the pre-formed antibodies present in the blood come for rescue. Hence, Sweety will not encounter chicken pox again.


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