Surveillance dashboards and reports on seasonal influenza

ECDC collects epidemiological and virological data from the EU/EEA Member States. The surveillance data reported comes largely from sentinel influenza surveillance systems, which cover a subset of the population in each country. Some countries conduct universal influenza surveillance, meaning that all cases meeting the relevant case definition are reported. Several countries also conduct surveillance of hospitalised cases. A sample of cases is also tested to determine virus characteristics.