This text represents the results of a symposium held by the American National Red Cross in Washington, DC, May 1974. It represents the most current data concerning diseases that can be transmitted to man by way of blood transfusion. Understandably, half of the book is devoted to a consideration of hepatitis, although not all of the material relates directly to blood transfusions. Surprisingly, more space is devoted to a discussion of the potential for transmission of arboviruses, especially Colorado tick fever, than to bacterial and spirochetol diseases, despite the fact that there is no evidence to suggest that arboviruses have ever been transmitted clinically by blood transfusion. The discussion of transfusion malaria is adequate although the bibliography is scanty.