Key facts
- A reproducing population of Aedes aegypti was detected in East London, United Kingdom, in August 2026. The population seems to be highly localised and is thought to have been introduced accidentally through imported plants or other goods from tropical regions.
- Local authorities have initiated vector surveillance and control measures with the aim of eliminating the population.
- In the absence of local transmission of mosquito-borne viruses, the public health risk associated with this event is considered low.
- Early detection through surveillance systems and public reporting mechanisms increases the likelihood of successful elimination before wider establishment occurs.
Overview
A very localised reproducing population of Aedes aegypti was identified in East London in August 2026. Preliminary investigations suggest the mosquitoes were accidentally introduced through imported plants or other commercial goods originating from tropical areas.
Public health and vector control authorities have implemented enhanced surveillance and control activities to limit the extent of the population and support eradication efforts. Control measures have been implemented to destroy larvae, and the affected area will continue to be monitored. UK HSA is encouraging public participation through the Mosquito Watch surveillance scheme to support early detection of invasive mosquitoes.
Ae. aegypti is not established in the UK however introductions of this species have previously been reported in other regions in Europe.
The initial detection was reported through the UK Health Security Agency (HSA) Mosquito Watch surveillance scheme. This event demonstrates the value of surveillance systems that facilitate reporting by the public, supporting early detection of introduced mosquito populations and increasing the likelihood that control measures can be implemented before wider establishment occurs.
ECDC assessment
Aedes aegypti is a competent vector of dengue, chikungunya, and Zika viruses. Incursions have previously been reported in several European countries, including the Netherlands and Luxembourg, and EU/EEA outermost regions). The detection in east London highlights the continued risk of invasive mosquito species being introduced into Europe through international trade and transport pathways.
At present, there is no evidence that Ae. aegypti is established in the UK, and it is unclear if Ae. aegypti could establish there in the current climate. The public health risk associated with this event is considered low, and there is no evidence of human infections associated with this event.