Medical dictionary. 2011.
immediate hypersensitivity — n, pl ties hypersensitivity in which exposure to an antigen produces an immediate or almost immediate reaction * * * 1. type I h. 2. occasionally, any form of hypersensitivity mediated by antibodies and developing rapidly, generally in minutes to … Medical dictionary
delayed hypersensitivity reaction — a reaction of cell mediated immunity, named in contrast to immediate hypersensitivity reactions because its onset is 24 to 72 hours after the antigenic challenge; the term is usually used to denote the subset of type IV hypersensitivity reactions … Medical dictionary
reaction — 1. The response of a muscle or other living tissue or organism to a stimulus. 2. The color change effected in litmus and certain other organic pigments by contact with substances such as acids or alkalies; also the property that such substances… … Medical dictionary
hypersensitivity — Abnormal sensitivity, a condition in which there is an exaggerated response by the body to the stimulus of a foreign agent. See allergy. contact h. 1. SYN: contact dermatitis. 2. SYN: delayed reaction. delayed h. 1 … Medical dictionary
pseudoallergic reaction — a clinical state exhibiting what appear to be the signs and symptoms of an immediate hypersensitivity reaction but with no evidence for an immunologic mechanism … Medical dictionary
hypersensitivity — In immunology, a state of excessive and potentially damaging immune responsiveness as a result of previous exposure to antigen. If the hypersensitivity is of the immediate type (antibody mediated), then the response occurs in minutes; in delayed… … Dictionary of molecular biology
Type I hypersensitivity — Infobox Disease Name = Type I hypersensitivity Caption = SEM of miscellaneous plant pollens. Pollens are very common allergens. DiseasesDB = ICD10 = ICD9 = ICDO = OMIM = MedlinePlus = eMedicineSubj = eMedicineTopic = MeshID = D006969 Type I… … Wikipedia
allergic reaction — noun hypersensitivity reaction to a particular allergen; symptoms can vary greatly in intensity • Syn: ↑allergy • Derivationally related forms: ↑allergic (for: ↑allergy), ↑allergist (for: ↑ … Useful english dictionary
late phase reaction — an IgE mediated immune reaction occurring 5 to 8 hours after exposure to antigen, after the wheal and flare reactions of immediate hypersensitivity have diminished; it is characterized by inflammation, with accumulation of neutrophils, basophils … Medical dictionary
Food allergy — Infobox Disease Name = Food allergy Caption = DiseasesDB = ICD10 = ICD10|T|78|0|t|66 ICD9 = ICD9|V15.0 ICDO = OMIM = 147050 MedlinePlus = 000817 eMedicineSubj = med eMedicineTopic = 806 MeshID = D005512A food allergy is an adverse immune response … Wikipedia
