The virus, which affects sheep and cattle, has been detected in the UK after “surges” across Europe.
Bluetongue, which is not dangerous to humans but can cause death in livestock, has been found in a sheep near Hadiscow, South Norfolk.
This is believed to be the first case of the virus in the UK for the 2024/2025 season.
A controlled zone has been declared around 20km from the Norfolk facility to minimise the risk of further spread.
The government said in May that there was a “high possibility” that infected midges had flown in from northern Europe and introduced the new virus strain, known as BTV-3.
Authorities said cases were rising sharply in the Netherlands and Germany, and new cases had also been confirmed in France, Luxembourg and Denmark.
The virus infects livestock such as cows, sheep, goats, deer and llamas, and symptoms include a swollen blue tongue, fever, reduced milk production and, in extreme cases, death.
England's deputy chief veterinary officer, Elle Brown, said on Monday that farmers should test their livestock frequently and report any suspicions to the Animal and Plant Health Agency.
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Free testing is available for animals traveling to or from the highest risk counties.
Bluetongue disease last hit the UK in November 2023, with 199 cases found in the five months to March 2024.
Of these, 119 cases were found in cattle and seven in sheep. At the time, Norfolk, Suffolk, Essex, Kent and East Sussex were designated high-risk areas.
