X-linked severe combined immunodeficiency

X-linked severe combined immunodeficiency (SCID) is an inherited disorder of the immune system that occurs almost exclusively in males. Children with X-linked SCID are prone to recurrent and persistent infections because they lack the necessary immune cells to fight off certain bacteria, viruses, and fungi. 

If untreated, infants with X-linked SCID can develop poor growth, chronic diarrhea, a fungal infection called thrush, skin rashes, and life-threatening infections. X-linked SCID can be detected shortly after birth by newborn screening, which allows for prompt treatment.

Other names

IL2RG SCID, T- B+ NK-; SCIDX1; X-linked SCID; X-SCID; XSCID

Inheritance pattern

X-linked recessive

Related genes

IL2RG

Source: MedlinePlus Genetics, U.S. National Library of Medicine.