Invasive Aedes aegypti mosquito breeds in London homes
The tropical mosquito Aedes aegypti, a potential carrier of dengue and Zika viruses, has been found breeding in east London for the first time.
An invasive tropical mosquito species has been found breeding inside homes in east London. This marks the first confirmed breeding of Aedes aegypti in the United Kingdom.
The UK Health Security Agency (UKHSA) identified the insects through its mosquito watch surveillance scheme. The agency stated the public health risk remains low, with no evidence these particular mosquitoes have caused human infections. This is the fourth time the species has been detected in the UK, but the first time it has been found reproducing.
Disease transmission potential
Aedes aegypti mosquitoes are normally found in tropical and subtropical regions. They are capable of transmitting dengue, chikungunya, and Zika viruses in countries where these diseases circulate. While rarely fatal, these illnesses can cause serious complications. Zika virus is linked to significant problems during and after pregnancy.
The UKHSA believes the mosquitoes could have entered the country in vehicles, luggage, or on imported plants. The agency said that despite evidence of breeding, the species is not established in the UK. The typical British climate is currently too cold for the insects to survive for extended periods.
Climate link and expert warning
However, the agency warned that a rapidly warming climate changes the equation. "We will continue to see incursions of invasive mosquitoes, and increased reports of them being able to survive in the UK," it stated. David Smith, advocacy and social change manager at the charity Buglife, agreed. He said the warming climate is creating conditions more favourable for exotic and potentially invasive species to establish themselves.
Smith linked the discovery to broader biosecurity failures. "Recent reports of non-native invertebrates, including mosquito species, highlight the urgent need for the government to strengthen biosecurity, improve surveillance and address pathways such as the movement of potted plants and soils," he said. He warned that numerous invertebrates can hitchhike undetected through these routes.
A separate study earlier this year found that higher temperatures, caused by the climate crisis, now allow for the transmission of chikungunya in most of Europe. That analysis was the first to assess how temperature affects the virus's incubation time within the Asian tiger mosquito, a related invasive species.
Response and public advice
The UKHSA has implemented control measures to destroy the mosquito larvae found in east London. The agency said the area will continue to be monitored closely to identify and eradicate any further mosquitoes and larvae.
The public can also take action. The UKHSA advises residents to remove standing water from gardens and outdoor spaces. This eliminates breeding sites for all mosquito species. Common sources include buckets, containers, paddling pools, and plant pots. The agency's ongoing surveillance aims to catch future incursions early, before new species can gain a permanent foothold.
