West Nile virus has been detected in mosquitoes in Britain for the first time, in a sign of how climate change is driving tropical diseases into new areas.
Researchers found fragments of the pathogen’s genetic material in insects collected in Nottinghamshire during July 2023. While most West Nile virus infections are asymptomatic, they cause problems including fever in about one-fifth of cases and potentially fatal severe illness in about one in every 150 people.
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