specific antibody deficiency lias been recognized as an immunodeficiency. in order to investigate an antipolysaccliaride antibody defect as a cause of rcccttrent infections, 30 children were studied. patients who had been identified to have a major immunodeficiency or structural abnormality or a disease known to cause infection were excluded. tliirty patints, aged i to 13.8 years (mean age, 5.8...