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Europe’s unusually warm and humid summer in 2025 contributed to 718 human cases of West Nile virus and 49 deaths in Italy alone.

Climate change is spreading dengue, chikungunya and West Nile virus worldwide

A new COP30 report finds that rising temperatures, extreme weather, evolving pathogens and climate-driven migration are reshaping disease patterns

  • Sheree Bega
7 min read