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Definition
 
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Alveolitis, Extrinsic Allergic Definition: A common interstitial lung disease caused by hypersensitivity reactions of PULMONARY ALVEOLI after inhalation of and sensitization to environmental antigens of microbial, animal, or chemical sources. The disease is characterized by lymphocytic alveolitis and granulomatous pneumonitis.
allergic pneumonitis Definition: conditions in which inhalation of organic dusts results in hypersensitivity reactions at the alveolar level, associated with the production of precipitins.
Aspergillosis, Allergic Bronchopulmonary Definition: Hypersensitivity reaction (ALLERGIC REACTION) to fungus ASPERGILLUS in an individual with long-standing BRONCHIAL ASTHMA. It is characterized by pulmonary infiltrates, EOSINOPHILIA, elevated serum IMMUNOGLOBULIN E, and skin reactivity to Aspergillus antigen.
Churg-Strauss Syndrome Definition: Widespread necrotizing angiitis with granulomas. Pulmonary involvement is frequent. Asthma or other respiratory infection may precede evidence of vasculitis. Eosinophilia and lung involvement differentiate this disease from POLYARTERITIS NODOSA.
Conjunctivitis, Allergic Definition: Conjunctivitis due to hypersensitivity to various allergens.
Dermatitis, Atopic Definition: A chronic inflammatory genetically determined disease of the skin marked by increased ability to form reagin (IgE), with increased susceptibility to allergic rhinitis and asthma, and hereditary disposition to a lowered threshold for pruritus. It is manifested by lichenification, excoriation, and crusting, mainly on the flexural surfaces of the elbow and knee. In infants it is known as infantile eczema.
atopic dermatitis Definition: chronic inflammatory skin disorder in individuals with a hereditary predisposition to a lowered threshold to pruritus; characterized by extreme itching, leading to scratching and rubbing that result in typical lesions of eczema.
experimental allergic encephalomyelitis Definition: autoimmune disease that can be induced in various experimental animals by the injection of homogenised brain or spinal cord in Freund's adjuvant.
Encephalomyelitis, Autoimmune, Experimental Definition: An experimental animal model for central nervous system demyelinating disease. Inoculation with a white matter emulsion combined with FREUND'S ADJUVANT, myelin basic protein, or purified central myelin triggers a T cell-mediated immune response directed towards central myelin. The pathologic features are similar to MULTIPLE SCLEROSIS, including perivascular and periventricular foci of inflammation and demyelination. Subpial demyelination underlying meningeal infiltrations also occurs, which is also a feature of ENCEPHALOMYELITIS, ACUTE DISSEMINATED. Passive immunization with T-cells from an afflicted animal to a normal animal also induces this condition. (From Immunol Res 1998;17(1-2):217-27; Raine CS, Textbook of Neuropathology, 2nd ed, p604-5)
Experimental Allergic Encephalomyelitis Definition: An autoimmune demyelinating disease of the central nervous system that is produced experimentally in animals by the injection of homogenised brain or spinal cord in Freund's adjuvant. Myelin basic protein appears to be the antigen that elicits the hypersensitivity immune response which is characterized by focal areas of lymphocyte and macrophage infiltration into the brain, associated with demyelination and destruction of the blood-brain barrier. Experimental allergic encephalomyelitis (EAE) is used as an animal model for demyelinating diseases of the human central nervous system such as multiple sclerosis. --2004
Hypersensitivity Definition: Altered reactivity to an antigen, which can result in pathologic reactions upon subsequent exposure to that particular antigen.
hypersensitivity Definition: state of previously immunized body in which tissue damage results from the immune response to a further dose of antigen.
Allergy Definition:

Hypersensitivity to an agent caused by an immunologic response to an initial exposure

Hypersensitivity Definition: Hypersensitivity; a local or general reaction of an organism following contact with a specific allergen to which it has been previously exposed and to which it has become sensitized.
hypersensitivity Definition: An exaggerated response by the immune system to a drug or other substance.
hypersensitivity Definition: An inflammatory response to an exogenous environmental antigen or an endogenous antigen initiated by the adaptive immune system. [GOC:jal, ISBN:0781735149 "Fundamental Immunology"]
Hypersensitivity Definition: A local or general reaction of an organism following contact with a specific allergen to which it has been previously exposed and to which it has become sensitized.
Neuritis, Autoimmune, Experimental Definition: An experimental animal model for the demyelinating disease of GUILLAINE-BARRE SYNDROME. In the most frequently used protocol, animals are injected with a peripheral nerve tissue protein homogenate. After approximately 2 weeks the animals develop a neuropathy secondary to a T cell-mediated autoimmune response directed towards the MYELIN P2 PROTEIN in peripheral nerves. Pathologic findings include a perivascular accumulation of macrophages and T lymphocytes in the peripheral nervous system, similar to that seen in the Guillaine-Barre syndrome. (From Adams et al., Principles of Neurology, 6th ed, p1314; J Neuroimmunol 1998 Apr 1;84(1):40-52)
Purpura, Schoenlein-Henoch Definition: A systemic non-thrombocytopenic purpura caused by HYPERSENSITIVITY VASCULITIS and deposition of IGA-containing IMMUNE COMPLEXES within the blood vessels throughout the body, including those in the kidney (KIDNEY GLOMERULUS). Clinical symptoms include URTICARIA; ERYTHEMA; ARTHRITIS; GASTROINTESTINAL HEMORRHAGE; and renal involvement. Most cases are seen in children after acute upper respiratory infections.
Vasculitis, Leukocytoclastic, Cutaneous Definition: Disorder characterized by a vasculitic syndrome associated with exposure to an antigen such as a drug, infectious agent, or other foreign or endogenous substance. Its pathophysiology includes immune complex deposition and a wide range of skin lesions. Hypersensitivity or allergy is present in some but not all cases.
Dermatitis, Allergic Contact Definition: A contact dermatitis due to allergic sensitization to various substances. These substances subsequently produce inflammatory reactions in the skin of those who have acquired hypersensitivity to them as a result of prior exposure.
Anti-Allergic Agents Definition: Agents that are used to treat allergic reactions. Most of these drugs act by preventing the release of inflammatory mediators or inhibiting the actions of released mediators on their target cells. (From AMA Drug Evaluations Annual, 1994, p475)
antiallergic agent Definition: group of agents that are used to treat allergic reactions; most of these drugs act by preventing the release of inflammatory mediators or inhibiting the actions of released mediators on their target cells.
Allergic Definition: Pertaining to, caused by, affected with or of the nature of allergy.
Allergic Rhinitis Definition: Inflammation of the nasal mucous membranes caused by an IgE-mediated response to external allergens. The inflammation may also involve the mucous membranes of the sinuses, eyes, middle ear, and pharynx. Symptoms include sneezing, nasal congestion, rhinorrhea, and itching. It may lead to fatigue, drowsiness, and malaise thus causing impairment of the quality of life.
 
 
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Heuschnupfen Definition: [1] Pollenallergie; saisonaler allergischer Schnupfen, der entsteht, wenn Allergene die Nasenschleimhaut reizen