Lord Cullen told the House of Lords that "There is a danger that Factor VIII, which has to be injected into haemophiliacs, can have in it a strain of hepatitis, and at the moment there is no way of testing for these strains. That is the one product as to whose freedom from infection we cannot be absolutely certain. However, every effort is made to see that it is not infected, and although occasionally something may happen, it is not of a serious nature."