A condition where elements of the immune system are defective or deficient and the individual may not be able to fight infections adequately; may be congenital (primary) or acquired (secondary).

A state in which the immune system’s ability to fight infectious disease is compromised or entirely absent.

The decreased ability of the body to fight infection and disease.

The diminished ability of the immune system to react with appropriate cellular immunity response; often the result of loss of immunoglobulins or aberrance of B- or T-cell lymphocytes.


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