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  2. Allergy - Wikipedia

    en.wikipedia.org/wiki/Allergy

    Allergies, also known as allergic diseases, are various conditions caused by hypersensitivity of the immune system to typically harmless substances in the environment. These diseases include hay fever, food allergies, atopic dermatitis, allergic asthma, and anaphylaxis.

  3. Type I hypersensitivity - Wikipedia

    en.wikipedia.org/wiki/Type_I_hypersensitivity

    Immunology. Type I hypersensitivity (or immediate hypersensitivity ), in the Gell and Coombs classification of allergic reactions, is an allergic reaction provoked by re-exposure to a specific type of antigen referred to as an allergen. [1] Type I is distinct from type II, type III and type IV hypersensitivities.

  4. Hypersensitivity - Wikipedia

    en.wikipedia.org/wiki/Hypersensitivity

    Hypersensitivity (also called hypersensitivity reaction or intolerance) is an abnormal physiological condition in which there is an undesirable and adverse immune response to antigen. [1] [2] It is an abnormality in the immune system that causes immune diseases including allergies and autoimmunity. It is caused by many types of particles and ...

  5. Oral allergy syndrome - Wikipedia

    en.wikipedia.org/wiki/Oral_allergy_syndrome

    Oral allergy syndrome ( OAS) or pollen-food allergy syndrome (PFAS) is a type of allergy classified by a cluster of allergic reactions in the mouth and throat in response to eating certain (usually fresh) fruits, nuts, and vegetables. It typically develops in adults with hay fever. [1]

  6. Allergen - Wikipedia

    en.wikipedia.org/wiki/Allergen

    Types of allergens. Allergens can be found in a variety of sources, such as dust mite excretion, pollen, pet dander, or even royal jelly. [2] Food allergies are not as common as food sensitivity, but some foods such as peanuts (a legume ), nuts, seafood and shellfish are the cause of serious allergies in many people.

  7. Type IV hypersensitivity - Wikipedia

    en.wikipedia.org/wiki/Type_IV_hypersensitivity

    Type IV hypersensitivity, in the Gell and Coombs classification of allergic reactions, often called delayed-type hypersensitivity, is a type of hypersensitivity reaction that can take a day or more to develop. Unlike the other types, it is not humoral (not antibody-mediated) but rather is a type of cell-mediated response.

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