West Nile Virus Spreads Northward in Europe with New Cases Reported in Berlin

The spread of West Nile virus (WNV), a mosquito-borne disease, is advancing across Europe, now reaching as far north as Berlin. According to recent reports, 14 European countries have documented locally acquired West Nile cases this year, totaling 989 infections. Italy leads with more than 700 cases, followed by Greece with around 90, and Serbia approximately 60. Germany has reported two cases, including one in its capital Berlin, marking a notable northern expansion of the virus facilitated by climate change. Public health experts including Klara Sondén, infectious disease specialist and deputy state epidemiologist, stress the importance of heightened public awareness about these emerging risks. As of 2025, the virus has resulted in over 60 deaths across Europe, with 40 fatalities since August alone. The European Centre for Disease Prevention and Control (ECDC) notes that this year's case numbers are higher than the average over the past decade but still below the severe peaks seen in recent years like 2018 and 2022. Additionally, the incidence of other mosquito-borne infections such as dengue and chikungunya has increased, especially in southern European countries like France, Italy, and Portugal. Researchers caution that although the risk of infection from short visits remains low, ongoing climate change could make such diseases endemic further north, including regions relevant to Sweden. Klara Sondén urges travelers to outbreak areas to observe a 28-day waiting period before donating blood, reflecting cautious public health measures in response to the expanding threat.