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Tuberculosis Contact Investigations in 2025
Sunmi Han1, Jiae Shim1, Seongju Choi1
1Division of Tuberculosis Policy, Department of Infectious Disease Policy, Korea Disease Control and Prevention Agency, Cheongju, Korea.
Public Health Weekly Report
|August 14, 2026
Summary
Tuberculosis contact investigations found more cases in older adults, who also had lower treatment initiation for latent TB. Enhanced screening and management are crucial for this demographic to improve TB control.
Area of Science:
- Public Health
- Epidemiology
- Infectious Disease Control
Background:
- Tuberculosis (TB) is an airborne illness requiring early detection and management to prevent spread.
- Treating latent tuberculosis infection (LTBI) is key to preventing active TB progression.
Purpose of the Study:
- To analyze TB contact investigation results from 2025.
- To assess contact management status and inform future TB control policies.
Main Methods:
- Analyzed household and congregate setting contacts of pulmonary TB patients in Korea.
- Stratified findings by age group and congregate setting type.
Main Results:
- Detected 233 additional TB cases (232.7/10^5 contacts) among 100,124 contacts.
- Highest TB case rate in contacts aged ≥80 years (496.0/10^5 contacts).
- Diagnosed LTBI in 24.7% of contacts; 55.4% initiated treatment, with rates decreasing in older age groups.
Conclusions:
- Older contacts (≥80 years) show high TB/LTBI rates but low treatment initiation, needing targeted interventions.
- Sustained management is essential for LTBI treatment completion, despite improvements.
- Future strategies include age-tailored management, support for MDR-TB contacts, and enhanced follow-up.
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