Mucosal candidiasis is common in combined immunodeficiencies e.g. CD40 ligand (CD40L) deficiency, NEMO (IKBG) deficiency, IKBA gain-of-function (GOF) mutation and DOCK8 deficiency, in addition to a broad range of viral, bacterial, and IFI (102, 103). Here, CD40LG is linked to hyperinsulinemic hypoglycemia, familial, 4.