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Immunological responses in late syphilis

R Shannon, C G Copley, G D Morrison

    The British Journal of Venereal Diseases
    |December 1, 1980
    PubMed
    Summary
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    Late syphilis patients show persistent antibodies (immunoglobulin M and G) against syphilis pathogens, unlike other stages. This stable serological pattern may indicate future symptomatic disease development.

    Area of Science:

    • Immunology
    • Infectious Diseases
    • Medical Diagnostics

    Background:

    • Syphilis diagnosis relies on detecting antibodies against Treponema pallidum.
    • Distinguishing between syphilis stages and predicting disease progression remains a clinical challenge.

    Purpose of the Study:

    • To investigate antibody profiles (IgM and IgG) in different stages of syphilis.
    • To identify serological markers that differentiate late syphilis and predict disease progression.

    Main Methods:

    • Serum samples from syphilis patients were analyzed using density gradient ultracentrifugation.
    • Antilipoidal and antitreponemal antibodies of IgM and IgG classes were quantified.
    • Antibody titers were monitored before and after treatment.

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    Main Results:

    • Late syphilis patients consistently exhibited persistent IgM and IgG antilipoidal antibodies and IgG antitreponemal antibodies.
    • Antitreponemal IgM antibodies were undetectable in late syphilis patients.
    • Unlike patients with secondary or latent syphilis, antibody titers in late syphilis patients did not decline post-treatment.

    Conclusions:

    • Persistent, stable antibody profiles, particularly the presence of IgM and IgG antilipoidal and IgG antitreponemal antibodies without a decline post-treatment, are characteristic of late syphilis.
    • This distinct serological pattern may serve as a predictor for the development of late symptomatic syphilis.