<prompt> Decreased T cell immunity is a feature of ?Digeorge syndromeHyper IgM syndromeSevere congenital neutropeniaChronic granulomatous diseas  <response>: Ans. is a i.e., Di George syndrome Classification of Primary Immune Deficiency Diseases Deficiencies of the Innate Immune System Phagocytic cells Impaired production severe congenital neutropenia SCN Asplenia Impaired adhesion leukocyte adhesion deficiency LAD Impaired killing; chronic granulomatous disease CGD Innate immunity receptors and signal transduction Defects in Toll-like receptor signaling Mendelian susceptibility to mycobacterial disease Complement deficiencies Classical, alternative, and lectin pathways Lytic phase 