Effect of Topical Versus Systemic Long Acting Corticosteroids on Tissue Eosinophilia in Cases of Allergic Rhinitis
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Nasal allergy is one of the commonly encountered conditions in daily practice of otolaryngology (about 10-15% of the population suffer from nasal allergy) (Soathil, 1973). Allergy can be defined as acquired altered reactivity of the tissues of the body to a specific antigen or allergens. The immune system is anatomically related to the lymophoreticular system. 1- Primary lymphoid organs: Thymus, skin, peyer's patchs. 2- Secondary lymphoid organs. Bone marrow lymph nodes, spleen and gut associated lymphoid tissue. The cells of the immune system are: 1) Lymphocytes which are responsible for the initial specific recognition of an antigen. They areprincipally divided into B-lymphocytes and Tlymphocytes according to their immunological preparation life spane.