immediate hypersensitivity
- immediate hypersensitivity
immediate hypersensitivity n,
pl -ties hypersensitivity in which exposure to an antigen produces an immediate or almost immediate reaction
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1. type I h. 2. occasionally, any form of hypersensitivity mediated by antibodies and developing rapidly, generally in minutes to hours (i.e., type I, II, or III h.), as distinguished from that mediated by T lymphocytes and macrophages and generally requiring 24 to 72 hours to develop (type IV h., sometimes called delayed h.).
Medical dictionary.
2011.
Look at other dictionaries:
immediate hypersensitivity reaction — 1. type I hypersensitivity r. 2. occasionally, any hypersensitivity reaction mediated by antibodies and developing rapidly, generally in minutes to hours (i.e., type I, II, or III hypersensitivity r.), as distinguished from those mediated by T… … 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
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
immediate allergy — see under hypersensitivity … Medical dictionary
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
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
type I hypersensitivity — A form of immediate hypersensitivity arising from the binding of antigen to IgE attached to mast cells, which then release anaphylaxis mediators such as histamine. Examples: hay fever, asthma, and food allergies … Dictionary of microbiology
type II hypersensitivity — A form of immediate hypersensitivity involving the binding of antibodies to antigens on cell surfaces followed by destruction of the target cells (e.g., through complement attack, phagocytosis, or agglutination) … Dictionary of microbiology
type III hypersensitivity — A form of immediate hypersensitivity resulting from the exposure to excessive amounts of antigens in which antibodies bind to the antigens and produce antibody antigen complexes. These activate complement and trigger an acute inflammatory… … Dictionary of microbiology
Electromagnetic hypersensitivity — (EHS) sometimes also called electrosensitivity or electrical sensitivity (ES) is a condition in which people experience medical symptoms that they believe are caused by exposure to electromagnetic fields. Although effects of electromagnetic… … Wikipedia
