 Evidence no. 2 blood transfusion safety. Current systems for blood donor screening by viral nucleic acid testing have dramatically reduced the risk of transmission of infectious conditions through the transfusion of blood and blood components. Accordingly, limitations to the use of allogeneic blood and blood components that were mandatory some decades ago do not find current justification. This opens the perspective of an increased use of allogeneic blood components - including platelet gel - with potential advantages for large numbers of patients in whom they are mostly indicated. 