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Unspecific Reactivity of IgM Directed Against the Low-Molecular-Weight Antigen of Toxoplasma gondii

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Abstract

During routine serological survey, eight patients (5 pregnant women, 3 grafted patients) were positive for Toxoplasma gondii-specific IgM by enzyme-linked immunoassay but negative by a simultaneously performed immunosorbent agglutination assay. No clinical or biological symptoms of toxoplasmosis were observed later, despite the absence of treatment. Only one IgM-reactive band, which corresponded to the low-molecular-weight antigen of Toxoplasma gondii, was observed by Western blotting of these patients' sera. Dot blotting of lipid extracts of Toxoplasma gondii demonstrated that this reactivity was directed against sphingolipids or ceramides. This IgM positivity, which is unrelated to acute toxoplasmosis, raises strong concerns about the possibility of misleading results of this test in the diagnosis of toxoplasmosis in humans.

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Acknowledgements

The skillful technical assistance of Mireille Kasperski and Anne-Marie Basile is gratefully acknowledged.

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Authors and Affiliations

  1. Service de Parasitologie-Mycologie, CHU de Nancy, 54511, Vandoeuvre les Nancy, France

    A. Dao, C. Eloundou Nga & B. Fortier

  2. Institut für Virologie, Zentrum für Hygiene und Med. Mikrobiologie, Philipps-Universität Marburg, Robert Koch Strasse 17, 35037, Marburg, Germany

    N. Azzouz & R. T. Schwarz

  3. UMR5539 CNRS, Université de Montpellier 2, Place Eugène Bataillon, 34095, Montpellier Cedex, France

    J. F. Dubremetz

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  1. A. Dao
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  2. N. Azzouz
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  3. C. Eloundou Nga
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  4. J. F. Dubremetz
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  5. R. T. Schwarz
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  6. B. Fortier
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Correspondence to A. Dao.

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Dao, A., Azzouz, N., Eloundou Nga, C. et al. Unspecific Reactivity of IgM Directed Against the Low-Molecular-Weight Antigen of Toxoplasma gondii . Eur J Clin Microbiol Infect Dis 22, 418–421 (2003). https://doi.org/10.1007/s10096-003-0948-9

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