When an individual is first exposed to the smallpox virus,several days pass before significant numbers of specific antibody molecules and T cells are produced.However,a second exposure to the virus causes a large and rapid production of antibodies and T cells.This later response is an example of

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This later response is due to immunological memory, which is the ability of the immune system to remember a previous encounter with a pathogen and mount a faster and more effective response upon subsequent exposures.

When an Individual Is First Exposed to the Smallpox Virus,several