hypersensitivity

(noun)

A disorder in which an adaptive immune response forms memory cells specific to antigens that aren't associated with pathogens.

Related Terms

  • cytotoxic hypersensitivity
  • delayed hypersensitivity
  • antigen presenting cell
  • antigen
  • antibody
  • macrophage

(noun)

any heightened immune response to an antigen; an allergy

Related Terms

  • cytotoxic hypersensitivity
  • delayed hypersensitivity
  • antigen presenting cell
  • antigen
  • antibody
  • macrophage

Examples of hypersensitivity in the following topics:

  • Hypersensitivity

    • A hypersensitivity reaction refers to an overreactive immune system triggered by allergies and autoimmunity.
    • Hypersensitivity (also called hypersensitivity reaction) refers to undesirable reactions produced by the normal immune system, including allergies and autoimmunity, and are commonly mediated by antibodies.
    • Hypersensitivity reactions require a pre-sensitized (immune) state of the host .
    • Cytotoxic Hypersensitivity (Type II) is an immune response to human cells with foreign antigens.
    • The common effects of Poison Ivy are the result of Type IV hypersensitivity.
  • Allergies

    • An allergy is a hypersensitivity disorder of the immune system.
    • Allergy is one of four forms of hypersensitivity and is formally called type I (or immediate) hypersensitivity.
    • If an immuno-response is seen, it can be concluded that the patient has a hypersensitivity (or allergy) to that allergen.
  • Glomerular Diseases

  • Types of Adaptive Immunity

    • This process is the reason why memory B cells can cause hypersensitivity (allergy) formation, as circulating IgE from those memory cells will activate a rapid inflammatory and immune response.
  • Systemic Lupus Erythematosus

    • It is a Type III hypersensitivity reaction caused by antibody-immune complex formation.
  • Myocarditis and Endocarditis

    • Myocarditis is most often due to infection by common viruses, such as parvovirus B19, less commonly nonviral pathogens such as Borrelia burgdorferi (Lyme disease) or Trypanosoma cruzi, or as a hypersensitivity response to drugs.
  • Coagulation

    • Additionally, endothelial damage caused by immune system factors like inflammation or hypersensitivity may also cause unnecessary thrombosis and embolism.
  • Overview of Adaptive Immunity

    • Additionally, the memory cell function enables the development of hypersensitivity disorders, such as allergies and many chronic diseases (like multiple sclerosis or myasthenia gravis).
  • Lymphoid Cells

    • Cytoxic T cells cause much of the damage associated with cell-mediated hypersensitivity, autoimmune disorders, and organ transplant rejection.
  • Active and Passive Humoral Immunity

    • Immunity derived from passive immunization lasts for only a short period of time, and there is potential risk for hypersensitivity reactions and serum sickness, especially from gamma globulin of non-human origin.
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