Severe Combined Immunodeficiency Due to Adenosine Deaminase Deficiency, also known as scid due to adenosine deaminase deficiency, is related to severe combined immunodeficiency, x-linked and adenosine deaminase deficiency. An important gene associated with Severe Combined Immunodeficiency Due to Adenosine Deaminase Deficiency is ADA (Adenosine Deaminase). The drugs Busulfan and Immunologic Factors have been mentioned in the context of this disorder. Affiliated tissues include skin and lymph node, and related phenotypes are failure to thrive and sinusitis