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 response is an example of

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This response is an example of immunological memory, where the body is able to mount a more rapid and robust response upon a second encounter with the same pathogen due to the presence of memory cells. Antibody molecules and T cells are produced more quickly upon re-infection, leading to a more effective immune response.

When an Individual Is First Exposed to the Smallpox Virus