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Common variable immunodeficiency (CVID) is the most common clinical primary immunodeficiency. It is characterized by a defect in B-cell differentiation to plasma and memory B cells. Moreover, numerous T-cell abnormalities have been reported and include decreased T-cell count and proliferative response, increased T-cell activation and apoptosis, and abnormalities in cytokine production. The aims of this review are to describe phenotypic and functional defects in T cells in CVID patients and to review the literature with respect to the effects of immunoglobulin replacement on the T-cell component in CVID patients.