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West Nile virus is making a troubling comeback in Europe. The Netherlands has recorded 18 infections and three deaths since the country's first locally contracted case in six years was detected in August 2026. Warmer temperatures are expanding mosquito habitats, with cases also rising in Greece and Italy.
West Nile virus is spreading across Europe at an alarming pace, and the Netherlands is feeling the impact. What started in mid-August 2026 with the country's first locally contracted infection since 2020 — in a patient showing only mild symptoms — has escalated rapidly. By early September, the Dutch public health institution RIVM confirmed 18 total infections and three deaths, with two of those fatalities occurring in Dutch hospitals in the most recent reporting period.
The virus, primarily transmitted through mosquito bites, only causes severe illness in about 1 in 150 infected people — but that fraction becomes significant as case counts climb. The Netherlands isn't alone: Greece and Italy have also seen rising case numbers this summer, pointing to a broader European trend.
By the Numbers:
Why it matters: The WHO attributes the surge to warmer temperatures extending mosquito season and expanding their geographic range across Europe. This outbreak is a stark reminder that climate change is reshaping infectious disease patterns — and public health systems need to adapt accordingly.
