An immune disorder is a dysfunction of the immune system. These disorders can be characterized in several different ways:
- By the component(s) of the immune system affected
- By whether the immune system is overactive or underactive
- By whether the condition is congenital or acquired
According to the International Union of Immunological Societies, more than 150 primary immunodeficiency diseases (PIDs) have been characterized.[1] However, the number of acquired immunodeficiencies exceeds the number of PIDs.[2]
It has been suggested that most people have at least one primary immunodeficiency.[3] Due to redundancies in the immune system, though, many of these are never detected.
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