immunodeficiency - immunological disorder in which some part of the body's immune system is inadequate and resistance to infectious diseases is reduced

monogenic disease, monogenic disorder - an inherited disease controlled by a single pair of genes

ADA-SCID - SCID resulting from mutation of a gene that codes for adenosine deaminase

X-linked SCID, X-SCID - SCID in male children resulting from mutation of a gene that codes for a protein on the surface of T cells that allows them to develop a growth factor receptor