Vaccination works on the principle of:
AInducing primary immune response and immunological memory — antigenic preparation (weakened/inactivated pathogen) generates memory B + T cells that respond rapidly on actual infection
BKilling pathogens directly with antibiotics
CBoosting innate immunity
DSuppressing the immune system
Answer & Solution
Correct answer: A. Inducing primary immune response and immunological memory — antigenic preparation (weakened/inactivated pathogen) generates memory B + T cells that respond rapidly on actual infection
**Vaccination** relies on **immunological memory**. Vaccine = antigenic proteins or weakened/inactivated pathogen → primary response → **memory B and T cells**. On real infection, secondary (anamnestic) response is rapid and overwhelming. Modern vaccines via recombinant DNA: e.g., hepatitis B from yeast.
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