Follow-up testing by flow cytometry revealed the canonical disruption in Natural Killer Group 2D (NKG2D) surface expression on CD8 T cells and NK cells, and clinical testing for congenital disorders of glycosylation (CDG) additionally verified the hallmark defect in glycosylation that underpins XMEN disease. This evidence concerns the gene CD8A and X-linked immunodeficiency with magnesium defect, Epstein-Barr virus infection and neoplasia.