Bird Virus Sweeping Through Britain

Avian pox has been recorded in British bird species such as house sparrows and wood pigeons for a number of years. However, the emergence of a new strain of this viral disease is causing concern amongst vets and ornithologists.

Wildlife vet Dr. Becki Lawson from ZSL says, "Infection leads to warty, tumor-like growths on different parts of a bird's body, particularly on the head around the eyes and beak.

"Although the disease can be relatively mild in some species, other cases can suffer severe growths that can prevent them from feeding and increase their susceptibility to predation," Dr. Lawson added.

A range of species are susceptible to this novel form of the disease, detailed monitoring of birds in Wytham Woods by scientists at the University of Oxford show that these species are by far the most susceptible.

"Although recovery from infection can occur, our results show that this new strain of avian pox virus significantly reduces the survival of infected species and has particularly large effects on the survival of juvenile birds," says Dr Shelly Lachish of the Edward Grey Institute at Oxford University.

With help from the public, scientists at the RSPB and ZSL have tracked the disease, which has spread rapidly in five years from south-east England to central England and into Wales. The annual seasonal peak of observed cases occurs in the early autumn months and incidents continue to be reported at this time of year.

Genetic studies on the virus show that it appears to be the same strain seen previously in Scandinavia and more recently in central Europe, and is unlikely to have originated within Great Britain. The spread of the virus to Britain is thought to have occurred through the arrival of an infected vector, such as a mosquito.

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