Booster doses of a vaccine are given in order to
Correct answer: B. raise the antibody level and strengthen immunological memory
- A. reduce the side effects of the first dose
- B. raise the antibody level and strengthen immunological memory
- C. replace antibodies that have expired
- D. treat an existing infection
Explanation
Each booster re-stimulates memory cells, driving antibody concentration higher and memory longer, the classic secondary response curve. Vaccines prevent rather than treat, so a booster is never therapy.
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About Specific Defense Mechanism
Specific defense mechanisms provide targeted immunity through B lymphocytes, T lymphocytes, antibodies and memory cells that recognize particular antigens. Questions cover humoral and cell mediated responses, clonal selection, primary and secondary immune responses, vaccination and passive immunity, while distinguishing adaptive defenses from the immediate, non specific innate response.
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