Weekly updates: 2020 West Nile virus transmission season

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Situation update

Between 23 and 29 October 2020, EU Member States reported two human cases of WNV infection: Greece (1) and Italy (1). These cases were reported from areas that have been affected during previous transmission seasons. This week, two deaths were reported by Greece. No human cases of WNV infection or deaths were reported from EU neighbouring countries.

Since the start of the 2020 transmission season and as of 29 October 2020, EU Member States have reported 308 human cases of WNV infection including 36 deaths through TESSy: Greece (143, including 22 deaths), Spain (76, including 7 deaths), Italy (66, including 5 deaths), Germany (12), Romania (6, including 1 death), Hungary (3), Bulgaria (1, including 1 death) and the Netherlands (1).
The province of Pazardzhik in Bulgaria, the province of Badajoz in Spain, the region of Utrecht in the Netherlands and five regions in Germany (Barnim, Ostprignitz-Ruppin, Saalekreis, Halle (Saale) and Meissen) reported locally-acquired human cases of WNV infection for the first time. All other cases were reported from areas that have been affected during previous transmission seasons. No cases have been reported from EU neighbouring countries.

Since the beginning of the 2020 transmission season, 178 outbreaks among equids have been reported. These outbreaks have been reported by Spain (136), Germany (20), Italy (12), France (5), Portugal (2), Austria (2) and Hungary (1) through the Animal Disease Notification System (ADNS). Since the beginning of the 2020 transmission season, two outbreaks among birds have been reported through ADNS, both by Bulgaria.

Data from the ECDC surveillance Atlas

Weekly maps

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West Nile virus in Europe in 2020 - human cases, updated 29 October 2020

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West Nile virus in Europe in 2020 - human cases compared to previous seasons, updated 29 October 2020

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West Nile virus in Europe in 2020 - infections among humans and outbreaks among equids and/or birds, updated 29 October 2020

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West Nile virus in Europe in 2020 - outbreaks among equids and/or birds, updated 29 October 2020

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Case definition

EU case definition for diagnosing and reporting West Nile virus infection, under Decision No 2119/98/EC of the European Parliament and of the Council.

ECDC publishes weekly WNV epidemiological updates during the WNV transmission season, including the geographical distribution of human cases in the EU/EEA and EU neighbouring countries. In addition, ECDC includes maps in its epidemiological updates highlighting areas where WNV outbreaks among equids have been reported. Read more