Abstract
Immune phenomena play a vital role in the health and disease of higher animals. Among these phenomena are (1) the protection conferred on higher animals against certain viral- and bacterial-induced diseases, either by their survival of an initial attack of the disease or by the deliberate injection of a modified form of the disease-producing agent (immunization); (2) the rejection of tissue or organ grafts from one individual to another of the same species; and (3) the occurrence of various diseases such as certain types of food allergy (Singer 1965).
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