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Evaluation of a serological test for tuberculosis.

D A Mitchison, V R Aber, F J Ahmad

    British Medical Journal
    |May 28, 1977
    PubMed
    Summary

    The Nicholls agglutination test is ineffective for diagnosing active tuberculosis. It produced positive results in tuberculosis patients, healthy contacts, and those with other conditions, indicating poor diagnostic accuracy.

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    Area of Science:

    • Medical Microbiology
    • Infectious Diseases
    • Diagnostic Immunology

    Background:

    • Tuberculosis (TB) diagnosis relies on accurate and sensitive methods.
    • The Nicholls agglutination test was previously explored as a diagnostic tool for TB.

    Purpose of the Study:

    • To evaluate the diagnostic efficacy of the Nicholls agglutination test for active pulmonary tuberculosis.

    Main Methods:

    • Assessed the Nicholls agglutination test's performance using serum samples from patients with newly diagnosed pulmonary tuberculosis, healthy family contacts, and patients with non-tuberculous conditions.
    • Compared results obtained from different laboratories to ensure technical consistency.

    Main Results:

    • A positive agglutination test (titre ≥ 1/125) was observed in 70% of active TB patients, 62% of healthy contacts, and 63% of patients with non-TB conditions.
    • No significant difference in results was found between laboratories, ruling out technical errors.
    • Retesting TB patients after chemotherapy initiation did not reveal a rising titre in those initially negative.

    Conclusions:

    • The Nicholls agglutination test demonstrates low specificity and sensitivity, rendering it ineffective for diagnosing active tuberculosis.
    • The test's high rate of false positives in healthy individuals and those with other conditions limits its clinical utility for TB diagnosis.

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