Timothy grass pollen sensitization in asthmatic egyptian children

ABSTRACT

Background: Allergic diseases are considered a major problem for healthcare systems in both developed and developing countries. Longitudinal epidemiologic studies have shown an increased prevalence of sensitization to common allergens, and increased prevalence of asthma, atopic dermatitis, food allergy, and allergic rhinitis in children. The increase in allergies is a phenomenon that is being observed in all fast-developing countries. For a long time, science has taken as a starting point that solely a genetic predisposition is a precondition for the development of an allergy. Today, knowledge of environmental factors that can alter genes or the transcription of genes in the cells, has improved