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Underlying immunodeficiency should be suspected in every patient, irrespective of age, who has recurrent, persistent, severe, or unusual infections. Defects in immunity can be classified into primary or secondary disorders involving specific or nonspecific immune mechanisms. Several forms of primary and secondary immunodeficiency exist for which various immunotherapeutic modalities are available. Significant among these are immunoglobulins commercially available for intravenous infusion. Other therapies include transplantation of tissue such as bone marrow, fetal liver, and fetal thymus. Enzyme replacement therapy is being developed, as is the use of products unique to immunocompetent cells, such as thymus extract, thymosin, interleukins, and transfer factor. Forms of nonspecific immune modulators and stimulators are other possibilities, especially in the context of the immunotherapy of tumors.
Underlying immunodeficiency should be suspected in every patient, irrespective of age, who has recurrent, persistent, severe, or unusual infections. Defects in immunity can be classified into primary or secondary disorders involving specific or nonspecific immune mechanisms. Several forms of primary and secondary immunodeficiency exist for which various immunotherapeutic modalities are available. Significant among these are immunoglobulins commercially available for intravenous infusion. Other therapies include transplantation of tissue such as bone marrow, fetal liver, and fetal thymus. Enzyme replacement therapy is being developed, as is the use of products unique to immunocompetent cells, such as thymus extract, thymosin, interleukins, and transfer factor. Forms of nonspecific immune modulators and stimulators are other possibilities, especially in the context of the immunotherapy of tumors.