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Related Experiment Videos

Rheumatoid factor in syphilis.

E H Cerny, C E Farshy, E F Hunter

    Journal of Clinical Microbiology
    |July 1, 1985
    PubMed
    Summary
    This summary is machine-generated.

    Rheumatoid factor (RF), antibodies against IgG, frequently appears in syphilis patients and can disrupt IgM tests. This study developed a method to remove RF, improving the accuracy of Treponema pallidum IgM testing for syphilis diagnosis.

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    Area of Science:

    • Immunology
    • Infectious Diseases
    • Serology

    Background:

    • Rheumatoid factor (RF), which are immunoglobulin M (IgM) antibodies targeting immunoglobulin G (IgG) antibodies, are prevalent in syphilis patients.
    • The presence of RF can interfere with serological tests that detect specific IgM antibodies, potentially leading to inaccurate syphilis diagnoses.

    Purpose of the Study:

    • To investigate the occurrence and specificity of RF in syphilis patients.
    • To develop and validate a simple method for detecting and removing RF to improve the accuracy of a Treponema pallidum IgM enzyme-linked immunosorbent assay (ELISA).

    Main Methods:

    • RF occurrence was measured using a sensitive ELISA, with reactivity assessed across different syphilis stages (primary, secondary, latent).
    • Immunoprecipitation using anti-human gamma chain antibodies and polyethylene glycol was employed to remove RF from reactive sera.

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  • The impact of RF removal on the sensitivity of the Treponema pallidum IgM ELISA was evaluated.

    • Main Results:

    • RF reactivity increased with syphilis duration: 1/13 primary, 3/13 secondary, and 10/27 latent syphilis sera were RF-positive.
    • Even after immunoprecipitation, some sera (1 secondary, 8 latent) remained RF-positive.
    • Removal of IgG antibodies, including RF, enhanced the sensitivity of the Treponema pallidum IgM ELISA, suggesting competitive binding to antigen.

    Conclusions:

    • RF is common in syphilis and can interfere with IgM-based diagnostics.
    • A simple immunoprecipitation method can effectively reduce RF interference.
    • Eliminating RF improves the sensitivity of IgM ELISA for detecting Treponema pallidum-specific antibodies, crucial for accurate syphilis diagnosis.