The likelihood of a host-to-host epidemic is highest when:
A) the proportion of immune individuals in a population is below the epidemic threshold.
B) the proportion of immune individuals in a population is above the epidemic threshold.
C) the proportion of immune individuals in a population is at the epidemic threshold.
D) anytime the proportion of immune individuals in a population rises above 50%.
E) the second time a pathogen is introduced into a particular population.
Correct Answer:
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