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|Noun||1.||allergic reaction - hypersensitivity reaction to a particular allergen; symptoms can vary greatly in intensity|
food allergy - allergic reaction to a substance ingested in food
atopic allergy, atopy, immediate allergy, type I allergic reaction - an allergic reaction that becomes apparent in a sensitized person only minutes after contact
serum disease, serum sickness - a delayed allergic reaction to the injection of an antiserum caused by an antibody reaction to an antigen in the donor serum
delayed allergy, type IV allergic reaction - an allergic reaction that becomes apparent only hours after contact
hypersensitivity reaction - an inappropriate and excessive reaction to an allergen (as pollen or dust or animal hair or certain foods); severity ranges from mild allergy to severe systemic reactions leading to anaphylactic shock