Serological reactivity against cyst and tachyzoite antigens of Toxoplasma gondii determined by FAST-ELISA. |
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| Authors: | Y W Zhang A Fraser A H Balfour T G Wreghitt J J Gray J E Smith |
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| Affiliation: | Department of Pure and Applied Biology, University of Leeds. |
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| Abstract: | AIMS--To obtain quantitative data on the human serological response to Toxoplasma gondii tachyzoite and bradyzoite antigens. METHODS--Serum samples from 30 patients who had positive antibody titres against T gondii and from 14 who were seronegative, together with sequential serum samples from four infected individuals, were screened by FAST-ELISA. RESULTS--Serum samples from the 30 seropositive patients showed high IgG and IgM titres against the T gondii tachyzoite antigen but very low responses to cyst antigen. This result was borne out in sequential serum samples from patients with toxoplasmosis. CONCLUSION--Antibody recognition of the cystic stage of T gondii is low, implying that either this stage is poorly immunogenic or that the antigen load is low. |
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