<prompt> Which is found in DiGeorge;s syndrome -TetanyEczemaTotal absence of T cellsAbsent B and T cells  <response>: Digeorge syndrome Digeorge syndrome is an example of a T cell deficiency that results from failure of development of the third and fouh pharyngeal pouches. Clinical features Enhanced susceptibility to viral, fungal mucocutaneous candidiasis and bacterial infections. Facial abnormalities : Hypeelorism, abnormal ears, sho philtrum and micrognathia. Hypocalcemic tetany due to failure of parathyroid development. Congenital hea diseases eg fallot;s tetralogy. Absence of a normal thymus. Serum immunoglobulin concentration are frequently normal, but antibody responses, paicularly of IgG and IgA isotypes, are usually impaired. T cell levels are reduced not total absence. B cell levels are normal. REF: Harrison book of internal medicine 21ST EDITION 