Related Experiment Videos
Protective value of BCG vaccination in children in Bangkok, Thailand
Insights
Bacille Calmette-Guérin (BCG) vaccination shows a significant 74% protective effect against tuberculosis, particularly in preventing disseminated forms of the disease in children. This immunity appears to manifest as localized tuberculosis.
Area of Science:
- Immunology
- Infectious Diseases
- Pediatrics
Background:
- The efficacy of bacille Calmette-Guérin (BCG) vaccination against tuberculosis remains a subject of debate.
- Tuberculosis (TB) continues to be a major global health concern, especially in pediatric populations.
Purpose of the Study:
- To evaluate the protective effect of BCG vaccination against tuberculosis in children.
- To compare the incidence of disseminated TB forms in BCG-vaccinated versus unvaccinated children.
Main Methods:
- A comparative study involving 330 pediatric TB patients and 1106 healthy controls.
- Analysis of BCG vaccination status and occurrence of various TB manifestations, including disseminated forms.
Main Results:
- BCG vaccination was associated with a significantly lower incidence of disseminated tuberculosis (meningitis, peritonitis, bone/joint TB).
- The study demonstrated an overall protective effect of 74% for BCG vaccination against TB.
- BCG vaccination was found to significantly reduce the frequency of tuberculous peritonitis and disseminated forms compared to pulmonary TB.
Conclusions:
- BCG vaccination provides a substantial protective effect against tuberculosis in children.
- The protective mechanism of BCG appears to involve inducing localized forms of the disease rather than preventing infection entirely.
Abstract:
The protective effect of bacille Calmette-Guérin (BCG) vaccination against tuberculosis is controversial. In a study, 330 patients less than 12 years of age with tuberculosis, 52.1% of whom had had BCG vaccination, were compared with a control group of 1106 patients free of tuberculosis, 81% of whom had BCG vaccination. The occurrence of disseminated forms of tuberculosis, tuberculous meningitis, tuberculous peritonitis, and tuberculosis of bone and joints in BCG-vaccinated patients was quite low. With BCG vaccination, the incidence of the disseminated form of tuberculosis was significantly lower than that of pulmonary tuberculosis with pulmonary parenchymal lesions, primary pulmonary complexes, and pleural effusion. Tuberculous peritonitis was significantly less frequent than pulmonary tuberculosis with pulmonary parenchymal lesions, enlarged hilar glands, pulmonary primary complex, and pleural effusions. The study demonstrated that BCG gave an overall protective effect of 74% and that a major effect of this immunity was to produce a localized form of tuberculosis.