It has been estimated that between 7,000 and 15,000 people were infected in the United Kingdom in the 10 years prior to 1991, equating to between 700 and 1500 in Scotland, or some 70-150 each year. The current residual risk of hepatitis C is now estimated to be around one in 10 million donations and at this rate it could be expected that Scotland would experience one hepatitis C transmission every 40 years.