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Tuberculosis notwithstanding BCG vaccination.

J Geefhuysen, I Freiman

    South African Medical Journal = Suid-Afrikaanse Tydskrif Vir Geneeskunde
    |September 27, 1975
    PubMed
    Summary
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    BCG vaccination offers some protection against tuberculosis, reducing severe disease and deaths in children. However, it does not prevent all cases, highlighting the need for continued vigilance and case finding for tuberculosis.

    Area of Science:

    • Pediatrics
    • Infectious Diseases
    • Immunology

    Background:

    • Bacille Calmette-Guérin (BCG) vaccination is widely used for tuberculosis (TB) prevention.
    • The effectiveness of BCG in preventing TB, particularly in diverse populations and exposure settings, warrants ongoing evaluation.

    Purpose of the Study:

    • To assess the incidence and characteristics of tuberculosis in BCG-vaccinated children.
    • To evaluate the impact of BCG vaccination on the severity, dissemination, and mortality of tuberculosis.

    Main Methods:

    • Retrospective analysis of 176 patients diagnosed with tuberculosis.
    • Specific focus on a subgroup of 40 BCG-vaccinated children within the larger cohort.
    • Comparison of disease characteristics between vaccinated and unvaccinated individuals.

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    Main Results:

    • Twenty-three percent (40/176) of children developed tuberculosis despite BCG vaccination.
    • BCG vaccination was associated with a reduced incidence of disseminated tuberculosis, including tuberculous meningitis, and fewer deaths.
    • A high rate of tuberculous contacts (40%) suggests significant exposure to infection.

    Conclusions:

    • BCG vaccination provides a degree of protection against severe forms of tuberculosis and mortality.
    • The findings underscore the importance of continuous surveillance of vaccine potency and vaccination techniques.
    • Vigilant case finding for tuberculosis remains critical, even in BCG-vaccinated individuals.