Current transmission efficiencies of blood components.

Table 2 identifies the number of positive transmissions of BSE, by the component transfused to recipients. The current transmission efficiency of each type of blood component was determined by calculating the number of recipients confirmed as having BSE (post-mortem) as a percentage of the total number of each component transfused. The attack rate for orally infected BSE donor sheep is shown for comparison. Blood components prefixed by ‘LR’ mean that they were leucoreduced prior to transfusion.