Three years after exposure to a virulent form of the flu, a population faces the same flu strain. The public health department recognizes that there are members of the population who have not been exposed to the flu strain. Which is most likely to happen?
A) The unexposed population will contract the illness
B) The unexposed population is not likely to contract the illness
C) The unexposed population will contract the illness and reinfect others
D) The flu will reach epidemic proportions and both populations will become ill
Ans: B
Feedback:
If a substantial proportion of people in a population are not susceptible to a communicable disease, the few people who are susceptible are not likely to be exposed and contract the illness. This is a process called herd immunity.
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