Usutu virus has once again been detected in Denmark. Two young blackbirds from the capital region tested positive for the virus in August, which was found in nearly 60 Danish birds last year.

This is the second consecutive year the virus has been identified in the country. In 2024, a total of 59 cases were recorded from August to October, involving 56 blackbirds, two great spotted woodpeckers, and one red kite. The recent findings were detected through the Fallen Game Surveillance and analyzed by the Danish Veterinary Consortium—a collaboration between the State Serum Institute and the University of Copenhagen.

“We are closely monitoring the situation. Even though it’s only two birds this year so far, it is important to collect and analyze the animals that citizens find so that we can track the spread of the virus,” says Louise Lohse, section leader and veterinarian at the State Serum Institute.

Usutu virus is transmitted by mosquitoes and mainly affects blackbirds, but it can also infect other bird species. Infected birds may appear weak or apathetic and exhibit altered behavior, such as losing coordination and falling during flight. Some may die without showing visible symptoms.

In rare cases, Usutu virus can cause illness in humans. Most individuals experience mild symptoms like fever, headache, or rash, but those with weakened immune systems can develop severe conditions such as encephalitis or meningitis.

Citizens are advised to use gloves when handling dead birds. Although the risk of transmission from birds to humans is low, dead birds may carry other diseases. If dead blackbirds are found, individuals can contact the Fallen Game Surveillance responsible for monitoring diseases in wild animals in Denmark.