Questions: 16 of 32 Concepts completed (i) Multiple Choice Question Why should a vaccine have high efficacy? It means that the vaccine is inexpensive to produce. It means that the vaccine has been tested in an ethical manner. It means that people who receive the vaccine will never need a booster. It means that the vaccine does what it is supposed to do. Need help? Review these concept resources.

The answer is the last one: It means that the vaccine does what it is supposed to do.

Explanation for each option:

• It means that the vaccine is inexpensive to produce.
  This option is incorrect. The efficacy of a vaccine refers to its ability to produce the desired immune response and protect against the disease, not its cost of production.

• It means that the vaccine has been tested in an ethical manner.
  This option is incorrect. While ethical testing is crucial, it is not directly related to the efficacy of a vaccine. Efficacy measures how well the vaccine works, whereas ethical testing refers to the process by which the vaccine is evaluated.

• It means that people who receive the vaccine will never need a booster.
  This option is incorrect. High efficacy does not necessarily mean that a booster will never be needed. Some vaccines with high initial efficacy may still require boosters to maintain immunity over time.

• It means that the vaccine does what it is supposed to do.
  This option is correct. High efficacy indicates that the vaccine effectively prevents the disease it is designed to protect against, achieving its intended purpose.

In summary, a vaccine with high efficacy effectively prevents the disease it targets, fulfilling its primary purpose.