Weekly updates: 2021 West Nile virus transmission season
This weekly report provides an overview of West Nile virus (WNV) epidemiology in the EU/EEA and EU-neighbouring countries during the WNV transmission season (expected to be June-November). Following a One Health approach, WNV infections in humans and outbreaks in equids and birds are included in the report. Visit the dedicated webpages for more information on WNV infections and ECDC’s seasonal WNV surveillance.
Between 10 and 16 September 2021, European Union (EU) and European Economic Area (EEA) countries reported 11 human cases of West Nile virus (WNV) infection and no deaths related to WNV infections. Cases were reported by Italy (5), Romania (3), Hungary (2) and Germany (1). EU-neighbouring countries reported 1 fatal human case of WNV infection in Serbia.
This week, among the reporting countries, the following NUTS 3 or GAUL1 regions have reported human cases of WNV infection for the first time: Spree-Neiße in Germany.
Since the beginning of the 2021 transmission season and as of 16 September 2021, EU/EEA countries have reported 98 human cases of WNV infection in Greece (43), Italy (32), Romania (7), Spain (5), Hungary (5), Austria (3) and Germany (3) and 5 deaths in Greece (3), Spain (1) and Romania (1). EU-neighbouring countries have reported 13 human cases of WNV infection in Serbia (13) and 3 deaths in Serbia (3).
During the current transmission season, within the reporting countries, human cases of WNV infection were reported from 41 different NUTS 3 or GAUL 1 regions, of which the following regions reported human cases of WNV infection for the first time: Spree-Neiße in Germany and La Spezia in Italy.
Since the beginning of the 2021 transmission season, 10 outbreaks among equids and 1 outbreak among birds have been reported by EU/EEA countries. Outbreaks among equids have been reported by Spain (7) and Germany (3). One outbreak among birds has been reported by Spain.
Data on human cases are collected via The European Surveillance System (TESSy) managed by ECDC. Only locally acquired cases with known place of infection are included in this report. The following EU-neighbouring countries report human cases of WNV infection to ECDC: Albania, Kosovo*, Montenegro, North Macedonia, Serbia and Turkey.
Animal data (i.e. outbreaks among equids and birds) are collected through the Animal Disease Information System (ADIS) of the European Commission. Reporting of WNV in equids and birds is mandatory at the EU/EEA level.
The distribution of human infections covers EU/EEA and EU-neighbouring countries, whereas outbreaks among equids and birds covers only EU/EEA countries.
* This designation is without prejudice to positions on status, and is in line with UNSCR 1244/1999 and the ICJ Opinion on the Kosovo declaration of independence
West Nile virus in Europe in 2021 - infections among humans and outbreaks among equids and/or birds, updated 16 September 2021
West Nile virus in Europe in 2021 - outbreaks among equids and/or birds, updated 16 September 2021
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