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Disease resistant chickens may be the first genetically engineered farm animals to reach the supermarket. Scientists in Scotland and Cambridge have produced poultry that can stop bird flu from spreading and are working on complete resistance to infection. The same technology can be used for pigs, sheep and cattle for a range of diseases . Sue Broom reports on the current state of the science of genetically engineered farm livestock and the ethical concerns that surround them. Producer, Erika Wright.
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