MONDO_0014278 (immunodeficiency 18) can be described as follows. Immunodeficiency-18 is an autosomal recessive primary immunodeficiency characterized by onset in infancy or early childhood of recurrent infections. Immunologic work-up of the IMD18 SCID patients shows a T cell-negative, B cell-positive, natural killer (NK) cell-positive phenotype, whereas T-cell development is not impaired in the mild form of IMD18. Also known as: CD3-Epsilon deficiency, IMD18, immunodeficiency 18, SCID variant, immunodeficiency 18, Severe combined immunodeficiency variant, immunodeficiency type 18.