The ECDC updates are based on available data reported through the European Surveillance System (TESSy) by the national public health authorities of EU/EEA countries.
Information on autochthonous vectorial transmission of dengue in mainland EU/EEA, including location, period, number of cases, virus serotype and mode of transmission.
ECDC monitors social media for epidemic intelligence purposes. This is done by monitoring a list of predefined users using Epidemic Intelligence from Open Sources (EIOS) and monitoring a list of predefined users on social media platforms.