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Verbal·Information and Ideas·Inferences
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The concept of “herd immunity” occurs when a sufficiently high proportion of a population becomes immune to an infectious disease, thereby limiting the spread of the disease and protecting individuals who are not immune. Epidemiologists agree that the exact threshold required for herd immunity varies depending on the specific disease’s contagion rate, but it typically ranges from 70% to 90%. Therefore, if a highly contagious virus emerges, public health officials must       
Which choice most logically completes the text?
A
aim to vaccinate or immunize a very large majority of the population to prevent widespread transmission.
B
assume that the virus will naturally disappear before 70% of the population is infected.
C
focus exclusively on treating the 10% of the population that is most vulnerable to the disease.
D
isolate the entire population until the contagion rate drops below 50%.