systemic anaphylaxis
anaphylactic shock anaphylactic shock n. (Med.) a severe form of physiological shock, often having a fatal outcome, caused by an extreme immunological reaction to antigens. It is a severe form of {anaphylaxis[2]}, and is characterized by smooth muscle contraction and capillary dilation throughout the body, initiated by antibodies of the IgE class. It is usually seen when an antigen to which a person has become hypersensitized is injected intravenously or subcutaneously. It is also called {generalyzed anaphylaxis} or {systemic anaphylaxis}, and sometimes {anaphylaxis}. --[Stedman] [PJC]

The Collaborative International Dictionary of English. 2000.

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