London School of Hygiene & Tropical Medicine (LSHTM) May 23 2025 Fragments of West Nile Virus have been identified in mosquitoes collected in the UK for the first time, according to a UK Health Security Agency (UKHSA) monitoring programme designed to understand the emergence and transmission of vector-borne disease in the UK.  West Nile Virus (WNV) is a vector-borne disease belonging to the Flaviviridae family, and is typically found in birds and bird-biting mosquitoes. In rare cases,