ECDC: Hungary, among other countries, facing a growing threat from mosquito-borne diseases

Europe is experiencing longer and more intense transmission seasons for mosquito-borne diseases, including West Nile virus (WNV) and chikungunya, according to the European Centre for Disease Prevention and Control (ECDC).

Climate and environmental changes are the main causes

Health experts say the shift is being fueled by climate and environmental changes, including rising temperatures, longer summers, milder winters and altered rainfall patterns — all of which create conditions for mosquitoes to thrive and spread viruses.

Pamela Rendi-Wagner, ECDC director, said in a statement on Wednesday: “Europe is entering a new phase — where longer, more widespread and more intense transmission of mosquito-borne diseases is becoming the new normal. ECDC is working closely with all member states to provide tailored support and timely public health guidance to strengthen Europe’s response.”

As of Aug. 13, 2025, eight European countries have reported 335 locally acquired human cases of WNV infection and 19 deaths. Italy is the most affected, with 274 confirmed cases.

Hungary also reported cases

Greece has reported 35 cases, followed by Serbia (9), France (7), Romania (6), Hungary (2), Bulgaria (1) and Spain (1).

France has also confirmed 111 cases of chikungunya virus disease, while Italy has reported seven. The outbreaks have primarily affected southern and southeastern regions.

No deaths have been reported in mainland Europe, but globally, more than 240,000 chikungunya cases and 90 deaths have been recorded this year.