This young infant was diagnosed at six months of age with "immunodeficiency type 19" (MIM#615617) due to homozygous nonsense variant, NM_000732.4 (<i>CD3D</i>):c.128G > A, p.Trp43∗ (variation ClinVar#VCV000643120.1; pathogenic). This evidence concerns the gene CD3D and immunodeficiency 19.