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Simplified assay for measuring Toxoplasma gondii immunoglobulin G avidity. Discussion We compared two chaotropic agents urea and sodium chloride described in the literature for avidity determination of aPL and tested the several possibilities for calculation of avidity indices. No difference was seen in the presence of various concentrations of NaCl as chaotropic agent. Single diluted serum vs multiple diluted serum modified. Prevalence and clinical significance of anticardiolipin antibodies in patients with type 1 autoimmune hepatitis. Various methods for avidity determination have been described. Important parameters for evaluation of antibody avidity by immunosorbent assay.

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