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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).