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. 1995 Oct;48(10):908–911. doi: 10.1136/jcp.48.10.908

Serological reactivity against cyst and tachyzoite antigens of Toxoplasma gondii determined by FAST-ELISA.

Y W Zhang 1, A Fraser 1, A H Balfour 1, T G Wreghitt 1, J J Gray 1, J E Smith 1
PMCID: PMC502944  PMID: 8537487

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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Selected References

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