<prompt> Decreased T cell immunity is a feature of -Digeorge syndromeHyper lgM syndromeSevere congenital neutropeniaChronic granulomatous diseas  <response>: Ans. is a i.e., Di George syndrome Classification of Primary Immune Deficiency DiseasesDeficiencies of the Innate Immune Systemo Phagocytic cells Impaired production severe congenital neutropenia SCN Asplenia Impaired adhesion leukocyte adhesion deficiency LAD Impaired killing; chronic granulomatous disease CGDo Innate immunity receptors and signal transduction Defects in Toll-like receptor signaling Mendelian susceptibility to mycobacterial diseaseo Complement deficiencies Classical, alternative, and lectin pathways Lytic phase Deficiencies of the Adaptive Immune Systemo T lymphocyteso impaired developmento Impaired survival, migration, functionSevere combined immunedeficieneies SOD DiGeorge syndrome.Severe combined immunodeficiencies.Hyper-lgE syndrome autosomal dominant.CD401 igand deficiency.Wiskott-Aldrich syndrome.Ataxia-telangiectasia and other DNA repair deficiencies.o B lymphocytesy Impaired developmenty Impaired function XL and AR agammaglobulinemiaHyper-IgM syndromeCommon variable immunodeficiencies CVIDIgA deficiencyRegulatory Defectso Innate immunityAutoinflammatory syndrome outside the scope of this chapter Severe colitiso Adaptive immunityHemophagoevtic lymphohistiocytosis HLHAutoimmune lymphoproliferation syndrome ALPSAutoimmunity and inflammatory diseases IPEX, APECEDAbbreviations: A PEC ED. autoimmune polyendocrinopathv candidiasis ectodermal dysplasia; AR, autosomal recessive,1PEX, immunodysregulation polyendocrinopathy enteropathy X-linked syndrome, XL, X-linked. 