t-cell immunity and serum levels of thymosin alpha 1 , beta 2-microglobulin , circulating immune complexes , serum immunoglobulin levels , antibodies to hepatitis surface or core antigen , and to cytomegalovirus , and epstein-barr virus were investigated in 51 patients with haemophilia a ranging in age from 2 to 52 years .
C0020964
immunity
C0003320
antigen