Question

Identify the incorrect option. Case clustering:

A. is of indeterminate significance for rare diseases, because clusters may occur by chance alone

B. suggests common exposure of a group of people to an etiologic agent

C. is called temporal clustering for geographic concentrations of cases

D. has been shown for angiosarcoma and vaginal carcinoma

E. None of these are correct.

Answer 1

C. is called temporal clustering for geographic concentrations of cases

Outbreak carries the same definition of epidemic, but is often used for a more limited geographic area. Cluster refers to an aggregation of cases grouped in place and time that are suspected to be greater than the number expected, even though the expected number may not be known.
Cluster: aggregation of cases in a given area over a particular period without regard to whether the number of cases is more than expected. Another reporting source for apparent clusters of both infectious and noninfectious disease is patients or other members of the community.

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