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Related Experiment Videos

The booster phenomenon in serial tuberculin testing.

N J Thompson, J L Glassroth, D E Snider

    The American Review of Respiratory Disease
    |April 1, 1979
    PubMed
    Summary
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    The tuberculin booster phenomenon, observed in all ages but increasing with age, can be triggered by prior tuberculosis or exposure to nontuberculous mycobacteria. A repeat test one week later helps distinguish new infections from boosted reactions.

    Area of Science:

    • Infectious Diseases
    • Immunology
    • Public Health

    Background:

    • Tuberculin skin testing is crucial for tuberculosis surveillance.
    • The booster phenomenon can complicate the interpretation of serial tuberculin tests.

    Purpose of the Study:

    • To investigate the frequency, magnitude, and causes of the tuberculin booster phenomenon.
    • To provide recommendations for interpreting serial tuberculin test results in healthcare settings.

    Main Methods:

    • 1,478 hospital employees received sequential intradermal tuberculin tests (PPD-T).
    • Most participants were also initially tested with PPD-G.
    • Booster phenomenon was assessed based on repeat testing intervals.

    Main Results:

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    • Boosting occurred in all age groups, increasing with age.
    • The phenomenon was observed as early as one week after the initial test.
    • Causes included remote tuberculosis infection or sensitization by nontuberculous mycobacteria.

    Conclusions:

    • A second tuberculin test one week after the initial test can help differentiate boosted reactions from new infections.
    • Individuals whose reactions convert after one year without boosting are likely newly infected with tuberculosis.
    • Understanding the booster phenomenon is essential for accurate tuberculosis control programs.