What is immunity based on?

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(D) Immunity is the ability of the host to fight against disease-causing organisms,conferred by the immune system. It is primarily based on the 'memor

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Memory of the immune system

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(D) Immunity is the ability of the host to fight against disease-causing organisms,conferred by the immune system. It is primarily based on the 'memory' of the immune system. When the immune system encounters a pathogen for the first time,it produces a primary response of low intensity. Subsequent encounters with the same pathogen elicit a highly intensified secondary or anamnestic response due to the memory of the first encounter.

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