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Idiopathic CD4 + T‐lymphocytopenia: Analysis of a patient with selective IgA deficiency and no evidence of HIV infection

Idiopathic CD4+ T‐lymphocytopenia (ICL) in HIV‐seronegative patients is a newly described, rare entity. The common underlying abnormality is a usually stable depletion in CD4+ lymphocytes in patients, some of which have unexplained opportunistic infections. We present a previously unreported condition of an asymptomatic individual with CD4+ T‐lymphocytopenia and a selective lgA deficiency. The subject is a 35‐year‐old healthy white male with a documented 5‐year history of low CD4+ T cell counts. He has been repeatedly HIV seronegative and has no risk factors for HIV infection. Data were obtained from several laboratories over a 5‐year period and include standard WBC differentials, HIV testing, serum immunoglobulin quantitation, mitogen stimulation assays, diphtheria and tetanus antitoxin titers, and flow cytometric immunophenotyping. The composite results show a subject with a normal white blood cell count, an absolute lymphopenia, a slight granulocytosis, and a selective lgA deficiency. Leukocyte subset analyses show essentially normal B but significantly altered T cell phenotypes. The normal CD4:CD8 ratio shows extreme inversion, primarily due to CD4 T‐lymphocytopenia. © 1995 Wiley‐Liss, Inc. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Cytometry Wiley

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