Fears that up to 100,000 Britons could die from eating lamb products infected with the human variant of mad cow disease have triggered calls for widespread animal screening and a ban on eating sheep organs.
The leader of the British research team from London's Imperial College, Neil Ferguson, said it was likely that BSE was in the sheep population and could pose a greater risk to humans than in cattle, because of the tighter controls on the sale of beef products.
He told Nature: "We cannot exclude the possibility that the epidemic is very large."
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