These pages focus on indicator-based surveillance, the systematic ongoing collection, analysis, interpretation and dissemination of highly structured information (‘indicators’) for public health action. Indicator-based surveillance is complemented by event-based surveillance, the detection, verification, analysis, assessment and further investigation of potential public health threats (‘events’). For more information on event-based surveillance, go to Epidemic Intelligence
Diseases and countries under EU surveillance
ECDC collects, analyses and disseminates surveillance data on 52 communicable diseases
and related special health issues from all 28 European Union (EU) Member States and two of the three remaining European Economic Area (EEA) countries (Iceland and Norway). Data submission and subsequent validation is the responsibility of European networks of disease experts
nominated by Member States and coordinated by ECDC through its disease programmes
Surveillance data and frequencies of reporting
Surveillance data collected at the European level are predominantly case-based and comprise demographic, clinical, epidemiological and laboratory information. They are reported annually (for most diseases and special health issues), quarterly (for salmonellosis and infection with enterohaemorrhagic E. coli), monthly (for measles and rubella), weekly (for influenza and West Nile fever) or daily (for travel-associated Legionnaires’ disease), as required for specific objectives, outputs and ensuing public health actions.
Joint efforts for standardising EU surveillance
The technical platform for EU/EEA communicable disease surveillance, i.e. web-based data submission, data storage and dissemination is The European Surveillance System (TESSy), a password-protected, fully anonymised database hosted by ECDC.
ECDC and nominated Member State surveillance experts are the default users of case-based EU/EEA surveillance data, but data access
may also be granted to third parties upon request.