Whether purified antigens of Lamblia intestinalis trophozoites can be used to detect these antibodies by immunoassay. The drugs of immunodominant Lamblia antigens were prepared by anion-exchange chromatography of solubilized trophozoite components and they are mainly presented by proteins having molecular weights of 70, 56, and 49 kD. Immunoassay using these antigens revealed antibodies to Lamblia trophozoite antigens in sera of 87.6% of patients with lambliasis (its diagnosis was established on the basis of microscopic data on the duodenal content) and only in 16.2% of clinically healthy blood donors. Twenty six sera from patients with trichomoniasis having high levels of antibodies to trichomonad antigens were studied to evaluate the specificity of this method for detection of antibodies. It has been found that the proportion of subjects in this group who have also antibodies to Lamblia antigens does not greatly differ from that of healthy blood donors (19.2 and 16.2, respectively).
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