If a vaccine is given to most people in a population, it can halt an infection because of
A)herd immunity.
B)people keeping away from each other.
C)an epidemic of autoimmunity.
D)bovine immunity.

Question

Quizplus · Accepted Answer

When a significant proportion of a population (usually estimated to be around 70-90%) is immune to a particular disease through vaccination, it is difficult for the disease to spread throughout the population because there are fewer susceptible individuals. This is known as herd immunity and can protect individuals who are unable to receive the vaccine or have weakened immune systems.

If a Vaccine Is Given to Most People in a Population