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Abstract The immune system plays a vital role in protection against foreign invaders as well as prevention of self-destructive behaviors. The immune system is divided into two major components, the innate system and the adaptive system. (Sadeghi et al., 2007) Immunodefeciency defined as defects in the development and functions in one or more of the components of the immune system which results in increased susceptability to infections which characterized by being recurrent, persistent or by being caused by unusual organisms. (Bonilla and Geha, 2006). |