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Vaccines and their role · NCERT Biology

Which of the following describes the principle of 'memory' in the context of vaccination?

  1. The ability of vaccine-derived antibodies to persist in the bloodstream for many years without decay
  2. The production of memory B and T cells that rapidly recognize the same pathogen on re-exposure
  3. The immediate generation of high-titre antibodies upon receiving the very first vaccine dose
  4. The physical scarring and local tissue reaction that remains at the injection site
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Correct answer: The production of memory B and T cells that rapidly recognize the same pathogen on re-exposure

Vaccines generate long-lived memory B and T cells after the initial immune response. On subsequent exposure to the same pathogen, these memory cells rapidly proliferate and produce large quantities of specific antibodies, providing fast and effective protection.

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