A person who has once had chickenpox usually does not get it again, because the body has developed immunity against it.

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True/FalseImmunity and Body's Natural Defence

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Which of the following is NOT a part of the body's own natural defence against germs?

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Explain how a vaccine protects us from a disease. Why are children given vaccines according to a fixed schedule, and how has vaccination helped India with diseases like polio?

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