predominantly children with immunologic deficiency of the humoral type ( 77 % of the cases ) characterized by unscheduled fatty transformation of the thymus , underdevelopment of b-zones of lymphoid organs , low level of igm production and the lack of igg and iga production were found to die with pneumonia , whereas children with physiological immaturity of the immune system and in smaller numbers ( 41 % of the cases ) with deficiency of immunity of the cellular and phagocytic type as confirmed by immaturity of the thymic tissue or its dysplasia with hypoplasia of lymphoid organs died with sepsis .
C0040113
thymus
C0020962
immune system