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Lymphocyte subpopulations were studied in 29 symptom-free Spanish prisoners who were active parenteral drug abusers. In 16/29 drug addicts (55%) the helper-inducer/suppressor-cytotoxic ratio (Leu 3a/Leu 2a) was less than 1. None of these 16 patients had lymphopenia and only 2 had a reduction in the number of Leu 3a cells. In drug addicts the number of lymphocytes (p less than 0.01) and the number and percentage of Leu 2a cells (p less than 0.001) were significantly raised. The addicts also had a higher absolute number of T cells when measured by their ability to react with the Leu 4 antibody (p less than 0.01). However, the E-rosette forming cells were significantly reduced. Thus the E-rosette test may lead to an overestimation of "null" cells. Furthermore drug addicts had a higher percentage (p less than 0.001) of Leu 7 positive cells (NK and K cells), but a normal percentage of B and phagocytic cells. Five drug addicts had generalized persistent lymphadenopathies, and 2 had skin anergy. We believe that most of the immunologic abnormalities seen in these apparently healthy drug abusers can be explained by an antigenic overload.
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