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المستخلص
Immunity is the ability of human body to resist almost all types of organisms or toxins that tend to damage the tissues and organs, and it is the function of the immune system which consists of a number of organs and different cell types which are: lymphoid cells and primary lymphoid organs, myeloid cells, cytokines, and secondary lymphoid organs. So that, any qualitative or quantitative dysfunction in any of these components due to any congenital or acquired disorders will lead to immunocompromization and increase in infectious complication .