type I hypersensitivity


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.

Microbiology. . 2009.

Look at other dictionaries:

  • Type IV hypersensitivity — Classification and external resources MeSH D006968 Type IV hypersensitivity is often called delayed type hypersensitivity as the reaction takes two to three days to develop. Unlike the other types, it is not antibody mediated but rather is a type …   Wikipedia

  • type IV hypersensitivity — hypersensitivity initiated by antigen specific T lymphocytes; unlike forms mediated by antibodies, it takes one or more days to develop and can be transferred by lymphocytes but not by serum. The term is often equated with delayed… …   Medical dictionary

  • type I hypersensitivity — hypersensitivity that occurs rapidly (within several minutes) upon reexposure to an antigen, due to interaction of IgE and the antigen; see type I hypersensitivity reaction, under hypersensitivity reaction, at reaction …   Medical dictionary

  • type II hypersensitivity — hypersensitivity resulting from antibody antigen interactions on cell surfaces; see type II hypersensitivity reaction, under hypersensitivity reaction, at reaction. Called also antibody mediated h …   Medical dictionary

  • type III hypersensitivity — hypersensitivity due to formation of circulating antigen antibody complexes and their deposition in tissues; see type III hypersensitivity reaction, under hypersensitivity reaction, at reaction. Called also immune complex–mediated h …   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

  • Type III hypersensitivity — Infobox Disease Name = PAGENAME Caption = DiseasesDB = ICD10 = ICD9 = ICDO = OMIM = MedlinePlus = eMedicineSubj = eMedicineTopic = MeshID = D007105 Type III hypersensitivity occurs when antigens and antibodies are present in roughly equal amounts …   Wikipedia

  • Type II hypersensitivity — In type II hypersensitivity (or cytotoxic hypersensitivity)cite web |url=http://pathmicro.med.sc.edu/ghaffar/hyper00.htm |title=Hypersensitivity reactions |format= |work= |accessdate=] the antibodies produced by the immune response bind to… …   Wikipedia

  • type IV hypersensitivity — A delayed hypersensitivity response (it appears 24 to 48 hours after antigen exposure). It results from the binding of antigen to activated T lymphocytes, which then release cytokines and trigger inflammation and macrophage attacks that damage… …   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


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