UK scientists have created the world's first genetically modified chickens that do not spread bird flu.
Writing in Science journal, the team says their work demonstrates it is possible to create a variety of GM farm animals resistant to viral diseases.
The research team inserted an artificial gene into chickens;
this introduces a tiny part of the bird flu virus into chicken cells.
These birds become infected but render the virus harmless to other poultry.
The team believes that the genetic modification they have introduced is harmless to the chickens and to people who might eat the birds.
Professor Helen Sang of Edinburgh University told BBC News
that genetic modification is potentially a much better way of protecting against diseases than vaccination because the GM technique works even if the virus mutates.
"It will protect a whole flock from avian influenza
infection. This is really exciting because bird flu is a real challenge to poultry production and if it were introduced to poultry breeding it would protect our large scale production flocks from avian inlfuenza," said Professor Sang.