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Related Terms:
Definitions:
Noun
                                                
                        
                            anaphylactic shock
                        
                                                
                                                    
                
                    
                    Definition: a severe and rapid and sometimes fatal hypersensitivity reaction to a substance (especially a vaccine or penicillin or shellfish or insect venom) to which the organism has become sensitized by previous exposure
Definition: A severe and rapid systemic allergic reaction to an allergen, constricting the trachea and generalized vasodilation.