Which of the following is an example of herd immunity?
A) Brucellosis is no longer found in farm animals in the United States.
B) Federal law requires that all cattle not immune to anthrax be destroyed.
C) If 70% of the population is immunized against polio, the disease will be essentially absent from the population.
D) All farm animals used for food must be immunized against all the common agents of disease that infect humans.

Question

Quizplus · Accepted Answer

Herd immunity occurs when a high percentage of a population is immune to a disease, either through vaccination or prior infection, which makes it difficult for the disease to spread. In this case, if 70% of the population is immunized against polio, the disease is unlikely to spread and will be essentially absent from the population, demonstrating herd immunity. Choices A, B, and D do not describe herd immunity.

Which of the Following Is an Example of Herd Immunity