1.4 Why is surveillance needed?

Surveillance is critical to:

  • assess pre-specified diseases or infections known to be continuously present (endemic) in the population,
  • determine the potential emergence of a previously unknown or re-emergence of a known disease as early as possible (particularly in ‘rabies-free’ situations),
  • determine the spatio-temporal distribution and spread of a disease once it has been detected,
  • gather insights about which factors contribute to disease emergence and distribution,
  • estimate the burden of a specific disease both in humans and other organisms,
  • monitor the effectiveness of control or elimination programmes aimed at reducing the disease burden,
  • demonstrate freedom once the disease has been eliminated.

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[en]Version 1 Last updated December 2014[fr]Première version, dernière mise à jour Juin 2015