Nearly three-quarters of supermarket chickens are contaminated with a potentially deadly bug, making it the biggest food safety concern in the UK, the Food Standards Agency has said. The FSA tests found Asda had the highest rate of contamination in its fresh whole chickens at 80%, followed by Co-op with 78%, Morrisons with 76%, Waitrose with 74%, and Tesco and Marks and Spencer with 67%.

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