| Definition of Surveillance
Surveillance is data collection for action. It is defined as the ongoing and systematic collection, analysis, interpretation, and dissemination of data about cases of a disease and factors influencing disease behavior, which is used as a basis for planning, implementing and evaluating disease prevention and control activities, including immunization.
Key elements of a Surveillance system
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ƒ detection and notification of VPDs
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ƒ investigation and confirmation (epidemiological, clinical, laboratory) of VPDs
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ƒ collection, analysis and interpretation of data
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ƒ feedback and dissemination of results
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ƒ prevention and control responses
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