Epidemiology Practice Test

Surveillance data are collected and analyzed continuously to track health events as they occur, so public health officials can see when and where problems are emerging and respond quickly. The immediate value lies in monitoring epidemics and emerging health problems, triggering investigations, alerts, and rapid actions to contain spread and protect communities.

Testing hypotheses and describing the natural history of diseases are important scientific activities, but they involve longer-term research processes and designs rather than the quick, action-oriented use of current surveillance data. Setting research priorities uses surveillance findings to guide what questions to study, which is a planning step rather than an immediate public health action based on ongoing data.