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allergy. (ăl′ər-jē) n. pl. aller·gies. 1. A condition in which exposure to a substance, such as pollen, latex, animal dander, or a particular food or drug, causes an overreaction by the immune system that results in symptoms such as sneezing, itching, rash, and difficulty breathing or swallowing. 2.
Allergy: A misguided reaction to foreign substances by the immune system, the body system of defense against foreign invaders, particularly pathogens (the agents of infection). The allergic reaction is misguided in that these foreign substances are usually harmless. The substances that trigger allergy are called allergen.
food allergy. A condition that is widely percieved to be a major health problem, the incidence of which (0.3–7.5%) has been obscured by controversial data and differing disease definitions; food-induced reactions of immediate-hypersensitivity type are well recognised and include anaphylaxis, angiooedema and urticaria; food-induced reactions of delayed hypersensitivity type (mediated by antigen-antibody …
Prodromal is a term relating to te period of time between the appearance of the first symptoms of an infectious disease and the development of a rash or fever. Infection -. invasion of the body by disease-producing organisms (pathogens) such as bacteria, fungi, protozoa, or viruses. Aseptic (adj.), asepsis -.
Definition of allergy. 1 : altered bodily reactivity (such as hypersensitivity) to an antigen in response to a first exposure a bee venom allergy so severe that a second sting may be fatal. 2 : exaggerated or pathological immunological reaction (as by sneezing, difficult breathing, itching, or skin rashes) to substances, situations, or physical states that are without comparable effect on the average individual.
A synonymous term that's been used over the decade has been hay fever, and that's somewhat of a misnomer because people are actually allergic to the pollen from the living trees, grasses, and weeds, and not so much cut hay. The respiratory symptoms can affect the eyes, the nose, and in a subgroup of people, even their lungs if they have asthma.
Read medical definition of Allergy. Year round or perennial allergic rhinitis is usually due to indoor allergens, such as dust mites or molds. Symptoms result from the inflammation of the tissues that line the inside of the nose (mucus lining or membranes) after allergens are …
Immunoglobulin E (IgE) are antibodies produced by the immune system. If you have an allergy, your immune system overreacts to an allergen by producing antibodies called Immunoglobulin E (IgE). These antibodies travel to cells that release chemicals, causing an allergic reaction. This reaction usually causes symptoms in the nose, lungs, throat, or on the skin.
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