West Nile Virus detected in UK mosquitoes for first time; public risk deemed low

UK health officials have confirmed the first detection of West Nile virus (WNV) in mosquitoes in the country, the Independent reported. Fragments of the virus’s genetic material were found in Aedes vexans mosquitoes collected in Nottinghamshire in July 2023. The UK Health Security Agency (UKHSA) stressed that the public risk remains “very low” but announced enhanced surveillance and control measures.

WNV, typically spread by bird-biting mosquitoes, is common in other parts of Europe and can cause flu-like symptoms or, in rare cases, severe illness such as encephalitis. No cases acquired within the UK have been recorded, though seven travel-related infections have been reported since 2000.

Experts linked the detection to climate change, which is enabling mosquito-borne diseases to expand into new regions. Officials advised the public to take precautions in wetland areas and for healthcare workers to test unexplained brain inflammation cases for WNV. Research and monitoring efforts are ongoing to assess future risks.