The word “allergy” was coined by the Viennese pediatrician Clemens von Pirquet in 1906. Pirquet noted that some of his patients were hypersensitive to normally innocuous entities such as dust, pollen, or certain foods.

It is also stated as a state of hypersensitivity induced by exposure to a particular antigen (allergen) resulting in harmful immunologic reactions on subsequent exposures; the term is usually used to refer to hypersensitivity to an environmental antigen. When a person is very sensitive to certain foods, liquids, pollen, or animals. The allergy can make the person ill, including sneezing, itching, and rashes. Severe allergies can even be fatal (cause death). Sensitivity to a substance, accompanied by sneezing, itching, watery eyes, difficulty breathing or rashes. Sometimes defines as an exaggerated or inappropriate immune response initiated by exposures to antigens such as mold spores, pollen, or certain drugs and foods.

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