Which statement best describes the purpose of a booster injection?

Which statement best describes the purpose of a booster injection?

• A. To increase the antibody titer
• B. To decrease the antibody titer
• C. To introduce an antibiotic
• D. To cause disease exposure

Answer: (A)

Boosters re-expose the immune system to the antigen, triggering a stronger secondary response. After the initial vaccination, memory B cells are formed; a booster reactivates these cells, leading to a faster, larger production of antibodies and a higher antibody titer that helps maintain protective immunity over time. This is not about decreasing antibody levels, administering antibiotics, or exposing animals to disease. The goal is to sustain adequate protection by keeping antibody levels elevated.

Boosters re-expose the immune system to the antigen, triggering a stronger secondary response. After the initial vaccination, memory B cells are formed; a booster reactivates these cells, leading to a faster, larger production of antibodies and a higher antibody titer that helps maintain protective immunity over time. This is not about decreasing antibody levels, administering antibiotics, or exposing animals to disease. The goal is to sustain adequate protection by keeping antibody levels elevated.