How do live attenuated vaccines differ from inactivated vaccines in terms of booster requirements?

How do live attenuated vaccines differ from inactivated vaccines in terms of booster requirements?

• A. Live attenuated vaccines require boosters
• B. Live attenuated vaccines do not require boosters
• C. Inactivated vaccines induce stronger, longer-lasting immunity with fewer boosters
• D. Inactivated vaccines require boosters

Answer: (D)

Live attenuated vaccines mimic natural infection by replicating in the body, which keeps the antigen present longer and stimulates both antibody and T-cell responses. This tends to produce a strong, durable immune memory, so a single dose often provides long-lasting protection and booster needs are relatively low. Inactivated vaccines, by contrast, do not replicate, giving a shorter duration of antigen exposure and typically prompting a weaker, primarily antibody-mediated response. That immune memory wanes more over time, so boosters are commonly required to maintain protection. Therefore, the statement that inactivated vaccines require boosters best captures the general difference between the two types.

Live attenuated vaccines mimic natural infection by replicating in the body, which keeps the antigen present longer and stimulates both antibody and T-cell responses. This tends to produce a strong, durable immune memory, so a single dose often provides long-lasting protection and booster needs are relatively low. Inactivated vaccines, by contrast, do not replicate, giving a shorter duration of antigen exposure and typically prompting a weaker, primarily antibody-mediated response. That immune memory wanes more over time, so boosters are commonly required to maintain protection. Therefore, the statement that inactivated vaccines require boosters best captures the general difference between the two types.