Why are booster doses administered in some immunization schedules?

Correct option is C

Sol. Booster doses are given to maintain or increase immunity over time. While the initial vaccine dose generates an immune response, immunity can weaken over time. Booster shots help reinforce immune memory, ensuring long-term protection against diseases such as tetanus, diphtheria, pertussis, and COVID-19.
Explanation of each option:
· (a) To prevent allergic reactions – Incorrect. Booster doses do not prevent allergic reactions, as allergies depend on individual immune responses rather than repeated vaccine administration.
· (b) To enhance the potency of the vaccine – Incorrect. The vaccine’s potency remains unchanged; boosters only re-expose the immune system to the antigen to strengthen immunity.
· (c) To maintain or increase immunity over time – Correct answer. Booster doses help extend and strengthen immune protection by stimulating memory cells to continue defending against infections.
· (d) To counteract vaccine side effects – Incorrect. Booster shots do not reduce side effects; they are meant to increase immunity. Some booster doses may actually cause mild side effects, such as pain at the injection site or mild fever.