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A population at risk is composed of 100 Starbucks employees. Twenty-five employees
developed symptoms consistent with inhalation of the anthrax and are confirmed by laboratory
testing to have been infected with Bacillus anthracis. If those 25 employees developed anthrax
during March and April, what is the incidence rate of anthrax over those two months? Assume
anthrax cases (1) are no longer susceptible after getting the disease and (2) were at risk for an
average of 1 month prior to diagnosis.
a. What is the numerator? b. What is the denominator? c. What is the incidence rate?

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