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  • Title: Circulating immune complexes and C3d in human parasitosis.
    Author: Verroust PJ, Adam C, Smith MD, Richard-Lenoble D, Kourilsky O, Morel-Maroger LJ.
    Journal: Kidney Int; 1979 Jul; 16(1):9-14. PubMed ID: 575177.
    Abstract:
    Using the Raji cell radioimmune assay, we found low levels of circulating immune complexes (IC) in a small percentage of patients with schistosomiasis and filariasis. C3d levels, measured by immunoprecipitation, were elevated in a large number of these patients, whereas complement levels were within normal limits. Proteinuria was not found in any of the 55 patients studied. Circulating IC or elevated C3d levels were not found in any of the 19 patients with hydatidosis. The increased C3d levels, apparently not related to circulating IC, may be due to direct complement activation by parasite antigens or to sequestered IC. The latter hypothesis appears more attractive because the highest levels of C3d were found in schistosomiasis whereas schistosome antigens were unable to activate complement in vitro.
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