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Published on: September 14, 2011
[Present activity of BCG and LTBI treatment for infants in Japan]
1Research Institute of Tuberculosis, Japan Anit-Tuberculosis Association (JATA), Tokyo, Japan. hhoshino@jata.or.jp
Insights
BCG vaccination and latent tuberculosis infection (LTBI) treatment strategies were analyzed for infants in Japan. Improved BCG coverage and contact surveys for LTBI treatment are recommended for infant tuberculosis prevention.
Area of Science:
- Pediatrics
- Infectious Diseases
- Public Health
Context:
- Tuberculosis (TB) prevention in infants is critical.
- Analysis focuses on 2008 infant notification data in Japan.
- Examines the roles of BCG vaccination and latent tuberculosis infection (LTBI) treatment.
Purpose:
- To evaluate the effectiveness of BCG vaccination and LTBI treatment strategies for infant TB prevention.
- To identify optimal timing and coverage for interventions.
- To inform public health policies for reducing infant TB incidence.
Summary:
- Early infant TB prevention relied on LTBI treatment, with limited notification.
- Later implementation of BCG vaccination showed high coverage (61.5-97.7%) and lower TB incidence in vaccinated infants.
- BCG vaccination demonstrated a protective effect, with lower breakdown rates compared to unvaccinated infants.
Impact:
- Findings suggest reinforcing contact surveys for LTBI identification and treatment.
- Improving BCG vaccination coverage is crucial.
- Targeted attention to unvaccinated infants over 6 months is recommended for effective infant TB prevention.
Abstract:
I analyzed the BCG vaccination and treatment of latent tuberculosis infection (LTBI) for infants notified in 2008 in Japan. BCG was not recommended and treatment of LTBI was the main activity for prevention of TB in infants from birth to age 2 months. The majority of notified LTBI cases were detected by contact surveys. Out of the estimated number of TB infected (148), only 2 cases were notified based on the outcome of LTBI treatment for 89 infants. When the infants were 3-5 months old, both BCG vaccination and LTBI treatment were implemented. BCG coverage was 61.5-97.7%, and LTBI treatment for non-vaccinated individuals was applied for a larger number of infants (1.04 to 7.82 times as many) than the estimated number of infants infected with TB. The majority of infants were BCG vaccinated when they were 6-11 months old. Although LTBI treatment coverage was low, only 5 cases developed among those receiving BCG vaccination. During 1-2 year, BCG coverage was high and breakdown rates of BCG-vaccinated children were much lower than those of non-vaccinated children. This difference might be due to not only the preventive effect of BCG but also risk difference of TB infection between BCG-vaccinated and BCG non-vaccinated individuals. The number of notified LTBI treatment cases was lower than the estimated number of children infected with TB during 1-2 year. To prevent infant TB, reinforcement of contact surveys to identify LTBI for treatment, improvement of BCG coverage, and attention to BCG non-vaccinated infants older than 6 months might be effective.
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