surveillance context Sentinel surveillance A surveillance context in which data are repeated collected from the same selected sites or groups of animals to identify changes in the health status of a specified population over time. Surveillance sentinels should act as a proxy for the larger population of interest; they may be selected on the basis of risk but can also be selected randomly or on the basis of convenience or compliance. https://github.com/SVA-SE/AHSURED/wiki https://www.fp7-risksur.eu/terminology/glossary