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Related Experiment Videos

Toxoplasmic lymphadenitis--clinical and serologic profile.

R A Durlach1, F Kaufer, L Carral

  • 1German Hospital, Buenos Aires, Argentina. rdurlach@hospitaleman.com.ar

Clinical Microbiology and Infection : the Official Publication of the European Society of Clinical Microbiology and Infectious Diseases
|August 20, 2003
PubMed
Summary

Accurate toxoplasmosis diagnosis relies on combining multiple serologic tests to interpret antibody kinetics. This approach improves the estimation of infection timing, especially when correlated with clinical symptoms like lymphadenitis.

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Area of Science:

  • Medical Parasitology
  • Immunology
  • Infectious Diseases

Background:

  • Toxoplasmosis diagnosis often relies on serologic testing to detect antibodies against *Toxoplasma gondii*.
  • Interpreting antibody kinetics is crucial for determining the timing of infection, which impacts clinical management.
  • Existing serologic tests have varying sensitivities and specificities, necessitating a comprehensive approach.

Purpose of the Study:

  • To evaluate the serologic profiles of various toxoplasmosis tests.
  • To enhance the interpretation of antibody kinetics for diagnosing toxoplasmosis.
  • To correlate serologic findings with clinical presentation, specifically lymphadenopathy.

Main Methods:

  • Clinical and serologic data from 120 patients with lymphadenopathy were analyzed over 18 months postinfection.

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  • Antibody kinetics were assessed using the Sabin-Feldman dye test, complement fixation, IgM immunofluorescent antibody test, and IgM immunosorbent agglutination assay (IgM-ISAGA).
  • Cell-mediated immunity was evaluated via the toxoplasmin skin test.

    • Main Results:

    • A negative Sabin-Feldman dye test after three weeks of lymphadenopathy excluded toxoplasmosis.
    • Positive Sabin-Feldman dye test with negative IgM-ISAGA indicated a non-recent infection.
    • High titers in IgM-ISAGA, IgM immunofluorescent antibody test, and complement fixation within three months strongly suggested recent infection.

    Conclusions:

    • Simultaneous application of multiple serologic tests improves the accuracy of estimating the time of *Toxoplasma* infection.
    • Serologic results correlate closely with the presence of clinical lymphadenitis.
    • This combined approach aids in a more precise diagnosis and interpretation of toxoplasmosis.