What Are Seasonal Allergies (Hay Fever) and How To Control it

Allergy is basically the clinical expression of atopy, which is the predisposition for production of IgE (a substance produced by the immune system when it reacts to an allergy). The immune response of the human body is totally dependent on the two subdivisions of T-lymphocytes (a subtype of white blood cells, important for the immune system) that are known as T helper cells TH1 and TH2.

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