My tuberculosis epidemiology journey: Implications for TB program interventions, activities and strategy

Area of Science:

• Public Health
• Epidemiology
• Tuberculosis Research

Background:

• Landmark studies offer critical insights into tuberculosis (TB) program strategies.
• Prevalence surveys and risk of infection studies inform current TB control efforts in India.

Purpose of the Study:

• To highlight key learnings from significant TB studies.
• To provide evidence-based recommendations for refining TB program strategies and achieving elimination targets.

Main Methods:

• Analysis of data from prevalence surveys, risk of infection studies, and case-finding studies.
• Review of modeling outputs and routine surveillance data.
• Evaluation of treatment regimens and intervention impacts.

Main Results:

• Prevalence surveys justify active TB case finding (ACF), Chest X-ray screening, and targeting the elderly. They also suggest re-evaluating sub-national certification methods.
• Risk of infection studies indicate 14 million new infections annually in India, necessitating a re-evaluation of elimination targets.
• Modeling suggests reducing urban transmission, rural treatment delays, and scaling up ACF and TB preventive treatment are vital. Case-finding studies support molecular diagnostics and caution against sole reliance on X-ray for ACF.
• Daily treatment regimens show lower recurrence rates than intermittent ones. Family-centered nutritional support and addressing pre-treatment catastrophic expenses are crucial for preventing TB mortality and incidence.

Conclusions:

• Learnings emphasize the need for revised strategies in TB case finding, vulnerable population identification, and program monitoring using metrics like 'TB deaths averted'.
• Focusing on reducing transmission, improving diagnostic approaches, and optimizing treatment regimens are essential for accelerating progress towards tuberculosis elimination.
• Addressing socio-economic factors, such as catastrophic expenses and nutritional support, is integral to a comprehensive TB control strategy.