Why are secondary or "booster" reimmunizations given?
A) Secondary immunizations are necessary for an innate immune response.
B) Secondary reimmunizations produce a secondary immune response and boost antibody titers.
C) Secondary reimmunizations produce a phagocytic immune response that is longer lasting than the primary immune response.
D) Frequent secondary reimmunizations are needed because the immune system doesn't remember antigens for more than a few years.
Answer: B
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