Classification of Hypersensitivity Reactions

Abstract
Early in the development of immunology, it was realized that individuals possessed the ability to recognize foreign materials by an immune system and to protect themselves against invasion by foreign agents, such as microbes, with this immune system. Somewhat later, it became evident that certain reactions of the immune system with a foreign material might be damaging to the host rather than protective, and terms such as allergy (altered state of reactivity) and hypersensitivity appeared. Throughout the first 76 years of this century, increasing numbers of different types of hypersensitivity reactions were found in the laboratory by purposeful induction of . . .

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