Which statement explains why vaccines may be given in series over time?

Which statement explains why vaccines may be given in series over time?

• A. To immediately eradicate the disease on first dose.
• B. To provide lifelong immunity with a single dose.
• C. To prime and boost the immune response for longer-lasting protection.
• D. To cause adverse reactions for research.

Answer: (C)

Vaccines in series are given to prime and then boost the immune response for longer-lasting protection. The first dose presents the antigen and starts the primary immune response, creating memory B and T cells. Later doses re-expose the immune system, increasing antibody levels, improving antibody quality (affinity), and expanding memory cells. This builds a stronger, longer-lasting defense than a single dose could provide. It’s not about eradicating disease with the first shot, guaranteeing lifelong immunity with one dose for all vaccines, or causing adverse reactions.

Vaccines in series are given to prime and then boost the immune response for longer-lasting protection. The first dose presents the antigen and starts the primary immune response, creating memory B and T cells. Later doses re-expose the immune system, increasing antibody levels, improving antibody quality (affinity), and expanding memory cells. This builds a stronger, longer-lasting defense than a single dose could provide. It’s not about eradicating disease with the first shot, guaranteeing lifelong immunity with one dose for all vaccines, or causing adverse reactions.