A cohort study is the best technique for analysing an outbreak in a small, well-defined
population.
Definition: epidemiological study in which subsets of a defined population can be
identified who are, have been, or in the future may be exposed or not exposed or exposed in
different degrees, to a factor, or factors hypothesized to influence the occurrence of a given
disease or other outcome. The main feature of a cohort study is observation of a large numbers
over a long period (commonly years) with comparison of incidence rates in groups that differ in
exposure levels.
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