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Sat 05 May 2004New fears over spread of vCJDBRITAIN: Just as concerns were abating, research published yesterday suggests the human form of mad cow disease in Britain could be more widespread than thought.Scientists have estimated that 3,800 people in Britain could be unwittingly carrying the prion protein responsible for variant Creutzfeldt-Jakob Disease (vCJD), a fatal brain-wasting condition.