ACCIDENTAL malaria subsequent to blood transfusion has not been a frequent occurrence in nonendemic areas. Since 1929 only 12 such cases have been reported to the Massachusetts Department of Public Health. In some other parts of the globe this route of transmission is more frequent. In Peiping, China, for example, Wang and Lee1 reported 54 cases of malaria complicating 3700 transfusions over a period of ten years. Thoroughman,2 working in Kiangsu, China, where malaria is encountered throughout the year, reported 45 cases of malaria after the administration of whole blood to 104 patients. In such endemic areas it is practically . . .