allergic reaction

DEFINITIONS OF: allergic reaction

Types:: show 4 types...; hide 4 types...; 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

Type of:: 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

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