Experts probe 'shock' arrival of mosquito virus in Scotland
The Usutu virus has been identified in Scotland following unusual blackbird deaths. Culex pipiens mosquitoes transmit the virus after feeding on infected birds. While it primarily affects birds and animals, humans can rarely be infected.
What changed
New reports identify the virus as the cause of unusual blackbird deaths and list human symptoms.
Live updates
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Usutu Virus Detected in Scotland for First Time
confidence 100%The Usutu virus has been identified in Scotland following unusual blackbird deaths. Culex pipiens mosquitoes transmit the virus after feeding on infected birds. While it primarily affects birds and animals, humans can rarely be infected.
What's confirmed:
- Usutu virus has been detected in Scotland for the first time.
- Culex pipiens mosquitoes transmit the virus after feeding on infected birds.
- The virus can spread to other birds, animals, and occasionally humans.
Still unconfirmed:
- Human symptoms of the virus include skin rash, fatigue, and fever.
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University of Glasgow confirms Usutu virus in Scottish blackbirds
confidence 90%The Usutu virus was identified in Scottish blackbirds for the first time following tests at the University of Glasgow. The virus is spread by Culex pipiens mosquitoes. These insects thrive at temperatures around 25C, which occur often during British summers.
What's confirmed:
- The University of Glasgow confirmed the Usutu virus was identified in blackbirds in Scotland for the first time in April.
- The Usutu virus is a mosquito-borne flavivirus.
Still unconfirmed:
- Culex pipiens mosquitoes that spread Usutu virus thrive at around 25C.
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Experts react to Usutu virus spread in Scotland
confidence 90%The Usutu virus, a mosquito-borne flavivirus, was first found in Scottish blackbirds during the summer of 2025. Specialist Heather Ferguson described the spread as an unprecedented event in her lifetime. No human cases have been reported.
What's confirmed:
- Usutu virus is a mosquito-borne flavivirus.
- The virus was first identified in blackbirds in Scotland during the summer of 2025.
Still unconfirmed:
- Heather Ferguson considers the virus spreading in Scotland an unprecedented event in her lifetime.
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Scotland's Usutu virus spread raises wildlife concerns as experts probe expansion
confidence 92%The mosquito-borne Usutu virus, previously limited to Africa and southern Europe, has now been detected in Scotland’s blackbird population on the Isle of Arran. Authorities confirm its arrival in 2025, defying earlier climate-based predictions, while human risk remains unproven. The virus has already decimated blackbird numbers in parts of Europe, prompting closer monitoring of wildlife health. No new human or environmental cases have been reported beyond the initial wildlife detections.
What's confirmed:
- The Usutu virus was confirmed in Scottish blackbirds on the Isle of Arran in 2025, marking its first recorded presence in the UK.
- Scientists previously considered Scotland’s climate too cold for the virus to establish itself, making its arrival unexpected.
- The virus has caused significant declines in blackbird populations across parts of Europe where it is endemic.
- UKHSA monitors emerging zoonotic infections, including those transmitted by mosquitoes, though no human cases of Usutu have been recorded in the UK.
Still unconfirmed:
- Local birdwatchers on Arran report unusually high blackbird mortality rates in 2026, though no official confirmation links this to Usutu.
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Usutu virus detected in Scotland for first time; experts probe spread
confidence 93%The mosquito-borne Usutu virus, previously confined to Africa and southern Europe, has been confirmed in Scotland for the first time. Authorities detected it in blackbirds on the Isle of Arran in 2025, surprising scientists who believed the climate too cold for its spread. Concerns focus on wildlife health, particularly bird populations, though human risk remains unclear. The virus has already caused significant blackbird declines in parts of Europe.
What's confirmed:
- The Usutu virus was detected in blackbirds in Scotland for the first time, confirmed by laboratory results in April 2026.
- Scientists previously believed Scotland’s climate was too cool for the Usutu virus to thrive, making its arrival unexpected.
- The virus has been linked to significant declines in blackbird populations in multiple European countries, including parts of the UK.
- Usutu virus is primarily spread by mosquitoes and has been circulating in south-east England for at least six years.
- Initial cases in Scotland were identified after blackbirds on the Isle of Arran died showing neurological symptoms in summer 2025.
- Biologists are most concerned about the virus’s impact on bird populations rather than direct human health risks at this stage.
Still unconfirmed:
- The virus was detected in midges in Scotland for the first time (source: single report, not yet confirmed by others).
- Infectious disease expert Heather Ferguson stated she never expected to see the virus spread in Scotland during her lifetime (anecdotal, not a confirmed fact).