Improvements to blood safety.
D001803:Blood Transfusion / Q000592:standards*; D007562:Creutzfeldt-Jakob Syndrome / Q000517:prevention & control*; D004739:England; D006801:Humans; D007231:Infant, Newborn / Q000097:blood; D014481:United States; D016635:Universal Precautions; D014766:Viremia / Q000517:prevention & control*