Immunological Defects

Primary Defects			Acquired Defects
	Bone Marrow
	Stem Cells
SCID			Immunosuppressives
	Lymphoid Stem Cells
HypoGG	Pre B-cells		Thymus	DiGeorge Syndrome
				Corticosteroids
	B-cells		T-cells	PNP Deficiency
Selective Deficiency
Myeloma	Plasma cells		TH-cells	AIDS
Hypercatabolism			TS-cells
	Immunoglobulins		CTLs