Country surveillance profile
Mosquito-borne disease in United Kingdom — 2025–2026 data
As of 17 June 2026, Mosticare tracks United Kingdom surveillance for West Nile virus. No autochthonous human cases are reported year-to-date in 2026. Each figure cites the responsible national or EU authority.
Last updated · 17 June 2026 · CC BY 4.0
The data
| Country / region | Disease | Cases | Deaths | Period | Source | Updated |
|---|---|---|---|---|---|---|
| United Kingdom | West Nile virus | 0 | 0 | 2025 transmission season | European Centre for Disease Prevention and Control (ECDC) — 2025 end-of-season West Nile virus surveillance (data to 3 December 2025) — UK Health Security Agency (UKHSA) for national status | 17 June 2026 |
About surveillance in United Kingdom
In the 2025 season the European Centre for Disease Prevention and Control (ECDC) lists 14 countries with locally acquired human West Nile virus cases; the United Kingdom is not among them, so its autochthonous count is zero. Post-Brexit the UK reports outside ECDC EU/EEA surveillance, with the UK Health Security Agency (UKHSA) as the national authority. In 2025 WNV genetic material was detected in UK mosquitoes for the first time, with no human cases. Invasive Aedes albopictus and Aedes aegypti are not established.
Frequently asked questions
What mosquito-borne diseases is United Kingdom monitoring in 2026?
Mosticare tracks United Kingdom surveillance for West Nile virus, each sourced to the responsible national authority or ECDC.
Were there any locally acquired West Nile virus cases in the UK in 2025?
No. The ECDC's 2025 season list of European countries reporting locally acquired (autochthonous) human West Nile virus cases names 14 countries — Italy, Greece, France, Serbia, Romania, Spain, Hungary, Croatia, Albania, Germany, North Macedonia, Bulgaria, Kosovo and Türkiye — and the United Kingdom is not among them. The UK Health Security Agency (UKHSA) confirms there have been no human cases of West Nile virus acquired in the UK to date.
Was West Nile virus really found in UK mosquitoes in 2025?
Yes — but only as viral genetic material in mosquitoes, not in any person. Under the joint UKHSA/Animal and Plant Health Agency VB-RADAR surveillance programme, fragments of West Nile virus (lineage 1a) were detected for the first time in UK mosquitoes — two pools of Aedes vexans collected in Nottinghamshire in July 2023, reported in 2025. There were no human cases and no evidence of onward transmission; UKHSA assessed the risk to the public as very low.
Are the invasive Aedes albopictus or Aedes aegypti mosquitoes established in the UK?
No. Neither is established. UKHSA-coordinated surveillance has recorded only transient incursions: four Aedes albopictus eggs at an M20 service station in Kent in 2024 (with no follow-on detections), and Aedes aegypti eggs at a freight facility near Heathrow in 2023. Establishment of self-sustaining populations is considered unlikely under current UK climatic conditions.
Does the UK report mosquito-borne disease data to the ECDC?
No longer. Since Brexit the United Kingdom is outside the ECDC EU/EEA surveillance system, and the UK Health Security Agency (UKHSA) is the national public-health authority for these data. Mosticare re-publishes UKHSA and ECDC figures and is not itself a surveillance authority.
Sources
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About this data
Mosticare aggregates and re-publishes vector-borne disease surveillance from ECDC, EFSA, and national ministries of health. Mosticare is an aggregator, not a primary surveillance authority — every figure on this page cites the originating source and is independently verifiable. This is a partial aggregation; for the complete EU/EEA totals, ECDC is the primary source.
The data behind this page is published as free, machine-readable feeds under CC BY 4.0 — the point-in-time incidence snapshot at /threat-map/feed.json (JSON Schema) and the multi-year trends at /threat-map/feed/trends.json (JSON Schema). See the live Europe threat map and the full data room.