When an infectious disease cannot spread in a population because it lacks a significant number of susceptible hosts, the phenomenon is referred to as
A) protected population.
B) active immunity.
C) passive immunity.
D) herd immunity.
E) protective immunity.

Question

Quizplus · Accepted Answer

Herd immunity occurs when a significant proportion of individuals within a population are immune to a disease, either through vaccination or previous exposure. This limits the spread of the disease because there are fewer susceptible hosts for the pathogen to infect.

When an Infectious Disease Cannot Spread in a Population Because