title: [Surveillance].
abstract: The article presents an outline of development of epidemiological surveillance in history and basic characteristics of principal types of surveillance being used in contemporary epidemiology. The role of disease definition and classification of diseases is stressed. The main features of the surveillance system are characterized. Basic methods of evaluation of such systems are also presented.
authors.forename: Andrzej
authors.initials: A
authors.lastname: Zieliński
mesh_terms: D004812:Epidemiologic Methods; D006801:Humans; D011159:Population Surveillance / Q000379:methods; D015203:Reproducibility of Results; D012107:Research Design