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Correlation between BCG genomics and protective efficacy.

M A Behr1

  • 1Montreal General Hospital, Quebec, Canada.

Scandinavian Journal of Infectious Diseases
|May 10, 2001
PubMed
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Bacille Calmette-Guérin (BCG) vaccine efficacy against tuberculosis varied widely in early trials due to differing methods, populations, and BCG strains. Genetic changes in BCG strains over time may explain efficacy differences, but require further study.

Area of Science:

  • Immunology
  • Vaccinology
  • Microbiology

Background:

  • Early clinical trials evaluated the protective efficacy of the bacille Calmette-Guérin (BCG) vaccine against tuberculosis from 1921 to the 1960s.
  • These trials exhibited significant variability in vaccine delivery, outcome interpretation, participant populations, and BCG vaccine strains used.
  • Reported protective efficacies against pulmonary tuberculosis ranged broadly, from approximately 80% to none.

Purpose of the Study:

  • To investigate the reasons behind the wide variability in BCG vaccine efficacy observed in early clinical trials.
  • To explore the potential impact of different BCG vaccine strains and their genetic modifications on observed protective efficacy.

Main Methods:

  • Review and analysis of historical clinical trial data for BCG vaccination against tuberculosis.

Related Experiment Videos

  • Examination of BCG vaccine strains used in trials, including their passage history and genetic characteristics.
  • Genomic analysis of BCG vaccines to identify genetic changes accumulated during in vitro passage.

    • Main Results:

    • Variability in trial methodologies, population genetics, and environmental exposures confounded direct comparisons of BCG efficacy.
    • Analysis indicated a potential trend of decreasing BCG efficacy with increased laboratory passage.
    • Genomic analysis revealed numerous genetic alterations (SNPs, duplications, deletions) in BCG strains over time.

    Conclusions:

    • Confounding variables make it challenging to attribute efficacy differences solely to interventions.
    • Genetic changes in BCG strains during prolonged in vitro passage represent a significant factor potentially influencing vaccine efficacy.
    • Further research is needed to determine the precise impact of BCG genomic alterations on protective efficacy in field trials.