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BQ 3A News > Blog > UK > First proof in the United Kingdom of breeding aegypti mosquito – the primary spreader of dengue, chikungunya and Zika
UK

First proof in the United Kingdom of breeding aegypti mosquito – the primary spreader of dengue, chikungunya and Zika

October 8, 2025
First proof in the United Kingdom of breeding aegypti mosquito – the primary spreader of dengue, chikungunya and Zika
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Scientists have discovered eggs of the Aedes aegypti mosquito in the United Kingdom for the primary time – a mosquito that spreads many tropical illnesses.

The eggs had been not too long ago came upon in a entice at a freight depot close to Heathrow airport and showed by way of DNA checking out to be Ae aegypti. The invention, led by way of the United Kingdom Well being Safety Company, additionally reported additional findings of Aedes albopictus, the “Asian tiger” mosquito, at a website in Kent in summer season 2024. Each species are invasive and thrive in heat, humid prerequisites.

Those Aedes mosquitoes subject as a result of they may be able to unfold viruses reminiscent of dengue, chikungunya and Zika. Outbreaks of those illnesses, as soon as confined to the tropics, at the moment are showing in Europe.

In 2024, Italy recorded over 200 in the neighborhood got dengue circumstances, basically within the Marche area, whilst France and Spain additionally reported home dengue transmission. Chikungunya has turn into any other Eu worry, with France reporting just about 500 in the neighborhood transmitted circumstances in 2025. Zika has now not but taken dangle in Europe, however the similar mosquito species may lift it if prerequisites permit.

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Two similar viruses, West Nile and Usutu, also are spreading additional north throughout Europe. West Nile virus has brought about outbreaks in birds, horses and other people throughout Europe, and has now been detected in the United Kingdom for the primary time.

In summer season 2023, scientists discovered West Nile virus genetic subject material in wild mosquitoes from samples gathered in Nottinghamshire. Usutu, which basically infects birds, was once first detected in London blackbirds in 2020 and has been present in birds or mosquitoes once a year since, making it now endemic to the United Kingdom.

Each viruses belong to the similar circle of relatives as Jap encephalitis, and even if they basically flow into in birds and mosquitoes, they may be able to additionally by the way infect people. Additionally they have a tendency to transport in combination. Usutu frequently establishes first, with West Nile following as temperatures upward push.

The United Kingdom Well being Safety Company notes that West Nile’s vary has not too long ago expanded “to more northerly and western areas of Europe”. In combination, those findings display how weather trade is moving mosquito-borne illnesses northwards.

Laboratory research have showed that local British mosquitoes may transmit those viruses below native UK-climate prerequisites. Analysis has proven a number of species can turn into inflamed or even go the virus on at conventional summer season temperatures.

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As an example, not unusual local Culex mosquitoes from England had been discovered in a position to transmitting Usutu of their saliva at simply 19°C. In the similar learn about, Culex pipiens and Culiseta annulata had been ready to transmit the United Kingdom Usutu pressure, suggesting the virus may unfold northwards.

Every other experiment discovered that the salt-marsh mosquito Ochlerotatus (Aedes) detritus can transmit West Nile at 21°C, however now not dengue or chikungunya. Blended, those effects reveal that local UK mosquitoes are ready to hold and transmit viruses like West Nile and Usutu if the correct weather prerequisites happen.

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Eggs of the Egyptian mosquito, Aedes aegypti, had been discovered at Heathrow.
Alexandre Rotenberg/Shutterstock.com

Extra welcoming

The trend is obvious: weather trade and international go back and forth are in combination loading the cube. Hotter summers, milder winters and heavier rainfall are making the United Kingdom extra welcoming to those bugs.

Local weather fashions already are expecting that Ae albopictus may turn into established in southern England inside the following couple of many years. On the similar time, extra other people and items are travelling between the United Kingdom and areas the place those illnesses are endemic, bringing each mosquitoes and infections with them.

The United Kingdom Well being Safety Company recorded masses of imported dengue and chikungunya circumstances ultimate yr. Every one a possible spark if the correct mosquitoes are provide.

The Animal and Plant Well being Company, a UK govt company, warns that this northward leap of mosquito-borne illnesses is “primarily driven by movement of people and global climate change”.

In undeniable phrases, the United Kingdom is warming into vary for those tropical “vectors” and the viruses they convey. Already, Ae albopictus breeds broadly throughout continental Europe, whilst native dengue and chikungunya outbreaks are showing additional north every yr. West Nile and Usutu are following a an identical trail.

The United Kingdom’s surveillance community, coordinated by way of the Well being Safety Company with universities and native government, is already tracking websites maximum susceptible to mosquito introductions. This coordinated manner is designed to catch incursions early and stay Britain forward of a impulsively moving international illness map.

The combo of a converting weather, global go back and forth and the power of those bugs to thrive method each invasive mosquito species and the viruses they convey are edging nearer to setting up in the United Kingdom.

The continued surveillance and early detection might be a very powerful to catch incursions sooner than they unfold. As Britain’s summers develop hotter and wetter, the bugs and illnesses as soon as confined to the tropics are discovering a brand new house – even in as of late’s not-so-chilly UK.

TAGGED:aegyptibreedingchikungunyaDengueevidencemainMosquitospreaderZika
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