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Effect of simultaneous BCG and smallpox vaccination in schoolchildren. Report of a WHO-sponsored preliminary study
Insights
Simultaneous Bacillus Calmette-Guérin (BCG) and smallpox vaccination showed no interaction. BCG vaccination did not affect smallpox immunity or the success of smallpox revaccination in Burmese children.
Area of Science:
- Immunology
- Vaccinology
- Pediatric Infectious Diseases
Background:
- Bacillus Calmette-Guérin (BCG) vaccination is a primary method for preventing tuberculosis.
- Smallpox vaccination has been historically significant in global public health.
- Understanding potential interactions between different vaccination schedules is crucial for optimizing immune responses and public health strategies.
Purpose of the Study:
- To investigate the effects of simultaneous BCG and smallpox vaccination.
- To examine the interaction between primary BCG vaccination and smallpox revaccination.
- To assess the impact of these vaccinations on tuberculin allergy and smallpox immunity.
Main Methods:
- A study involving 1099 Burmese children allocated into four groups.
- Tuberculin testing was performed on all participants.
- Groups received combinations of BCG vaccine, smallpox vaccine, or no vaccination.
- Smallpox revaccination 'take' and post-vaccination tuberculin allergy were compared.
Main Results:
- No evidence of interaction was found between simultaneous BCG and smallpox vaccination.
- Smallpox revaccination success rates were similar in tuberculin-negative and tuberculin-positive children.
- BCG vaccination did not influence naturally acquired tuberculin allergy or smallpox immunity after one year.
Conclusions:
- Simultaneous BCG and smallpox vaccination does not appear to interfere with each other's efficacy.
- BCG vaccination does not negatively impact smallpox immunity or the effectiveness of smallpox revaccination.
- Findings suggest that combined vaccination strategies can be safely implemented without compromising individual immune responses.
Abstract:
The effect of simultaneous BCG and smallpox vaccination and the possible interaction of primary BCG vaccination and smallpox revaccination were studied in 1099 Burmese children arbitrarily allocated to four groups. All were tuberculin-tested and all had received primary smallpox vaccination but had not been vaccinated with BCG. In the first group, no vaccination was performed; in the second, negative reactors received BCG vaccine; the third received smallpox vaccine; and the fourth also received smallpox vaccine, negative reactors also receiving BCG vaccine.Comparison of the "take" of smallpox revaccinations in the third and fourth groups and the post-vaccination tuberculin allergy in the second and fourth groups gave no suggestion of interaction.There was no difference in the take of smallpox revaccination between tuberculin-negative and tuberculin-positive children, nor did smallpox vaccination influence naturally acquired tuberculin allergy.Smallpox revaccination had no apparent effect on the frequency distribution of BCG vaccination lesions, and further smallpox revaccination after one year showed that BCG vaccination had not influenced smallpox immunity.