TB Tales: journey to slay bacteria
On World TB Day (March 24), health observers assessed India's progress toward tuberculosis elimination, noting a 21% reduction in new TB cases between 2015 and 2024 and a 28% reduction in TB deaths over the same period.
India carries approximately 25% of the global TB burden, with around 2.5–2.6 million cases reported annually, making its trajectory the single most important factor for global TB elimination targets.
Experts highlighted that climate change is an emerging threat to TB progress — climate-driven malnutrition, overcrowding during extreme weather events, and disruption of health systems are expected to exacerbate TB transmission and worsen treatment outcomes.
India's 100-Days TB Elimination Campaign (launched December 2024) has screened over 20 crore vulnerable persons and diagnosed over 28 lakh TB patients across 347 districts in 33 states.
WHO recommended new diagnostic tools on World TB Day 2026, including an AI-assisted chest X-ray interpretation tool and a urine-based point-of-care test, to accelerate detection in high-burden settings.
The theme for World TB Day 2026 is "Yes! We can end TB" — emphasising both hope and the need for stronger political will and funding.
India's National TB Elimination Programme: Architecture and Tools
India's National Tuberculosis Elimination Programme (NTEP), formerly the Revised National Tuberculosis Control Programme (RNTCP), aims to eliminate TB — defined as less than 1 case per 100,000 population — by 2025, five years ahead of the global SDG target of 2030. The programme operates through a cascade of screening, diagnosis, treatment, and support mechanisms. Nikshay, a real-time digital platform, tracks every TB patient from notification to treatment completion.
Key Details
- RNTCP launched: 1992; renamed NTEP in 2020
- India's TB elimination target: By 2025 (compared to WHO's global target of 2030)
- Nikshay digital platform: Tracks 2.63 million TB patients (2024 data); enables real-time monitoring
- Nikshay Poshan Yojana (2018): ₹1,000/month direct benefit transfer to notified TB patients; ₹4,454 crore disbursed to 1.38 crore beneficiaries as of 2024
- Rapid molecular testing network: 9,800+ facilities nationwide; annual testing capacity >14 million; world's largest TB diagnostic network
- Drug susceptibility testing labs: 107 culture and DST laboratories
- TB Mukt Bharat: Campaign framework; target = zero TB deaths, zero new infections, zero suffering
The 21% incidence reduction since 2015 is a result of NTEP's expanded diagnostic infrastructure and the Nikshay Poshan Yojana — but the pace needs to accelerate significantly to meet the 2025 elimination target, which most experts now concede will be missed.
Tuberculosis: Biology, Drug Resistance, and Treatment
TB is caused by Mycobacterium tuberculosis, primarily affecting the lungs (pulmonary TB) but also capable of affecting other organs (extrapulmonary TB). First-line treatment involves a 6-month regimen of DOTS (Directly Observed Treatment Short-course) using four drugs: isoniazid, rifampicin, pyrazinamide, and ethambutol. Drug-resistant TB (DR-TB) complicates treatment significantly. Multidrug-resistant TB (MDR-TB) is resistant to at least isoniazid and rifampicin; extensively drug-resistant TB (XDR-TB) is resistant to a wider range of drugs.
Key Details
- DOTS (Directly Observed Treatment Short-course): WHO-endorsed strategy; first-line treatment duration 6 months
- MDR-TB treatment: 18-20 months; BPaL regimen (Bedaquiline + Pretomanid + Linezolid) — newer, shorter DR-TB treatment regimen
- BCG vaccine: Only TB vaccine currently available; highly effective against severe childhood TB but less effective against adult pulmonary TB
- Global TB deaths (2023): ~1.25 million
- India's contribution: ~25% of global cases (~2.5–2.6 million cases/year)
- Latent TB: One-fourth of the world's population is estimated to carry latent M. tuberculosis — the TB reactivation risk is a significant challenge
Climate change's threat to TB progress operates partly through malnutrition (which suppresses immunity, increasing TB reactivation) and partly through disruption of DOTS adherence during extreme weather events — precisely the weak links in TB treatment cascades.
Climate Change and Infectious Disease: The Emerging Nexus
The Intergovernmental Panel on Climate Change (IPCC) Sixth Assessment Report (2022) confirmed that climate change is already affecting the geographic distribution of vector-borne diseases and worsening conditions for airborne pathogens. For TB specifically, climate-driven food insecurity causes undernutrition — a leading risk factor for TB (undernourished people have 3 times higher TB risk). Heat stress and extreme weather events also displace populations into overcrowded settings, increasing TB transmission. Climate change is therefore a threat multiplier for TB, HIV, and other poverty-linked diseases.
Key Details
- IPCC AR6 (2022): Confirmed health as a major climate risk sector; called for urgent mitigation and adaptation
- Undernutrition and TB: Malnutrition increases TB risk 3-fold; global warming threatens food security in TB-endemic zones
- Vector expansion: Climate change expands range of mosquitoes (malaria, dengue) and sandflies (leishmaniasis)
- Migration and TB: Extreme weather events cause population displacement, creating dense settlements with poor ventilation — ideal TB transmission conditions
- India's climate vulnerability: Coastal flooding, heat stress in Indo-Gangetic Plain, and drought-driven food insecurity directly threaten the populations most vulnerable to TB
The recognition that climate change will exacerbate TB's burden links two of India's most significant development challenges — it reinforces why climate adaptation and health system strengthening must be pursued simultaneously, not as separate policy silos.
- India's TB incidence reduction (2015-2024): 21%
- India's TB death reduction (2015-2024): 28%
- India's share of global TB burden: ~25% (~2.5–2.6 million cases/year)
- World TB Day theme 2026: "Yes! We can end TB"
- 100-Day TB Campaign (Dec 2024): Screened 20+ crore, diagnosed 28+ lakh TB patients, 347 districts, 33 states
- Nikshay Poshan Yojana: ₹1,000/month; ₹4,454 crore disbursed to 1.38 crore beneficiaries (since 2018)
- Rapid molecular testing network: 9,800+ facilities; capacity >14 million tests/year
- India's TB elimination target: 2025 (WHO global target: 2030)
- BCG vaccine: Only licensed TB vaccine; most effective for childhood forms