One case of smallpox occurs in a population in which it was considered to be previously elimi-nated. Which of the following best describes what has occurred?
a. Endemic
b. Epidemic
c. Pandemic
d. Infectivity
ANS: B
The occurrence of one case of smallpox in a population in which it was considered to be previ-ously eliminated is an epidemic. Endemic refers to the constant presence of a disease within a geographic area or population. Pandemic refers to an epidemic occurring worldwide and affect-ing large populations. Infectivity is the ability to enter and multiply in the host.
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