| A rare T-B+ severe combined immunodeficiency characterized by profoundly decreased levels of T-cells, normal B-cells, and low immunoglobulin levels. The thymus is present. Patients typically become symptomatic in infancy or early childhood with recurrent infections. Epstein-Barr virus (EBV)-associated B-cell lymphoproliferative syndrome/lymphoma and mucocutaneous-immunodeficiency syndrome have been reported in association. Some patients may show developmental delay, neurocognitive impairment, and behavioral dysfunction (in particular attention deficit-hyperactivity disorder). |
