Unrecognized Tuberculosis: Risk Factors for Smear-Positive/Cavitary Asymptomatic Cases
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By
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Jee Youn Oh
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Timothy C Rodwell
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Rehan R Syed
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Yousang Ko
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Jinsoo Min
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Hyung Woo Kim
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Hyeon-Kyoung Koo
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Yun-Jeong Jeong
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Eun Hye Lee
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Bumhee Yang
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Ganghee Chae
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Ju Sang Kim
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Sung-Soon Lee
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Hun-Gyu Hwang
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Jaehee Lee
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Heung Bum Lee
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Juock Na
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Jae Seuk Park
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March 22, 2025
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Clinical Scorecard: Identifying Risk Factors for Asymptomatic Smear-Positive/Cavitary Tuberculosis Cases: Insights from a National Cohort Study
At a Glance
| Category | Detail |
|---|
| Condition | Asymptomatic pulmonary tuberculosis (TB) |
| Key Mechanisms | Transmission risk indicated by positive sputum acid-fast bacillus smear or cavitation on chest radiographs |
| Target Population | Asymptomatic patients with pulmonary TB in South Korea |
| Care Setting | Hospitals affiliated with the National Public–Private Mix (PPM) TB Control Project in South Korea |
Key Highlights
- Among 20,455 pulmonary TB patients, 36.4% were asymptomatic; 25.5% of these had transmission risk factors (smear-positive or cavitary lesions).
- Risk factors for higher transmission risk include male sex, low BMI, current smoking, diabetes mellitus, and autoimmune disease.
- Mortality was higher in asymptomatic patients with transmission risk factors (9.3%) compared to those without (7.1%).
Guideline-Based Recommendations
Diagnosis
- Use a combination of clinical, radiographic, microbiological, and histopathological evidence to diagnose active TB in asymptomatic patients.
- Screen asymptomatic populations with risk factors such as male sex, low BMI, smoking, diabetes, and autoimmune diseases.
Management
- Targeted screening of asymptomatic patients with identified risk factors to reduce transmission.
- Implement anti-TB treatment and monitoring according to national guidelines for patients diagnosed with asymptomatic pulmonary TB.
Monitoring & Follow-up
- Regular sputum acid-fast bacillus smear testing and chest radiographs to assess transmission risk.
- Monitor mortality and treatment outcomes in asymptomatic patients, especially those with transmission risk factors.
Risks
- Asymptomatic patients with smear-positive or cavitary TB pose a significant transmission risk.
- Higher mortality risk is associated with asymptomatic patients who have transmission risk factors.
Patient & Prescribing Data
Asymptomatic pulmonary TB patients in South Korea, especially lean, smoking men with diabetes and/or autoimmune diseases.
Patients with identified risk factors require prioritized screening and management to reduce transmission and mortality.
Clinical Best Practices
- Prioritize active screening for asymptomatic TB in populations with male sex, low BMI, current smoking, diabetes, and autoimmune diseases.
- Use comprehensive diagnostic criteria combining clinical, radiographic, and microbiological data for asymptomatic TB detection.
- Implement continuous data quality audits and standardized data collection in TB cohort studies to inform public health strategies.
References
