ECDC gathers surveillance data from EU Member States on 52 communicable diseases and conditions using the European Surveillance System (TESSy).

European surveillance is conducted through disease networks that report data to ECDC on a regular basis.

A key role of ECDC is to analyse and interpret the data from Member States and disseminate the information: both through specific surveillance reports on the various communicable diseases and through a number of standardised tables and charts that are available directly from the TESSy website.