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Folia Microbiol (Praha). 1995;40(4):360-6. doi: 10.1007/BF02814744.

Common variable immunodeficiency: clinical aspects and recent progress in identifying the immunological defect(s).

Folia microbiologica

M M Eibl, H M Wolf

Affiliations

  1. Institute of Immunology, University of Vienna.

PMID: 8763150 DOI: 10.1007/BF02814744

Abstract

Common variable immunodeficiency (CVID) comprises a heterogeneous group of patients with as yet undefined genetic defects. Patients with CVID have in common a decrease in the levels of one or more serum immunoglobulin isotypes and a severe defect in the production of specific antibodies. Typically, the patients suffer from recurrent infections of the upper and lower respiratory tract or the gastrointestinal tract. In consequence of these infections patients may develop severe organ damage, such as chronic pulmonary disease with bronchiectases, leading to pulmonary failure. Early diagnosis of CVID is important, as antibody deficiency can efficiently be treated by regular intravenous IgG (IVIG) substitution therapy. IVIG therapy prevents the occurrence of further acute infectious episodes and the development of long-term complications. The basic immunological defect(s) in patients with CVID are still unknown. There is currently no convincing evidence for an intrinsic B-cell defect in patients with CVID. A defect in T-cell activation due to impaired signal transduction upon T-cell receptor triggering has been described in a large subgroup of patients with CVID. Defective T-cell activation may lead to an impairment in cognate T-B-cell interaction due to impaired expression of CD40 ligand and/or abnormalities in the production T-cell-derived cytokines required for fully functional B-cell activation, proliferation and/or differentiation which could indeed explain the impairment in antibody production present in CVID patients.

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