Strengthening India’s Fight Against Tuberculosis Through New Vaccine Innovations

Context

Recent findings from the Indian Council of Medical Research (ICMR)’s Phase III PreVenTB study have demonstrated that the indigenous vaccines VPM1002 and Immuvac offer meaningful protection against Extrapulmonary Tuberculosis (EPTB), opening new avenues for India’s TB elimination efforts.

Advancing Tuberculosis Control in India

Understanding Tuberculosis (TB)

Tuberculosis is a contagious bacterial infection caused by Mycobacterium tuberculosis. The disease primarily spreads through airborne droplets released when an infected individual coughs, sneezes, or speaks. Although many infected individuals remain symptom-free due to latent infection, weakened immunity can trigger active disease.

Major Forms of Tuberculosis

Pulmonary Tuberculosis (PTB):

The most prevalent form of TB affecting the lungs.
Responsible for the majority of disease transmission.
Symptoms include persistent cough, fever, chest pain, and weight loss.

Extrapulmonary Tuberculosis (EPTB):

Occurs when TB bacteria infect organs outside the lungs.
Commonly affects lymph nodes, bones, kidneys, brain, and spine.
Difficult to diagnose due to non-specific symptoms and limited detection tools.

Present Scenario of Tuberculosis

Global Burden

TB remains among the deadliest infectious diseases globally.
Millions of new infections and deaths are recorded every year, particularly in developing nations.

Concentration in Developing Regions

Low- and middle-income countries continue to account for the largest share of TB cases.
Overcrowding, poverty, and malnutrition contribute to sustained transmission.

Challenge of Achieving Elimination

Public health agencies define TB elimination as reducing incidence to fewer than 10–20 cases per 100,000 population.
Many countries, including India, still remain significantly above this threshold.

Limited Vaccine Options

The century-old BCG vaccine provides protection mainly against severe childhood TB.
Effective vaccines for adolescents and adults remain limited.

Major Obstacles to TB Eradication

Hidden Nature of Extrapulmonary TB

EPTB often develops in internal organs where routine sputum tests are ineffective.
Delayed diagnosis frequently leads to complications.

Gaps in Diagnostic Access

Advanced molecular testing facilities are unevenly distributed.
Rural and underserved regions face significant diagnostic delays.

Impact of Poor Nutrition

Malnutrition weakens immunity and increases susceptibility to TB infection.
Vaccine effectiveness may also decline among undernourished populations.

Complex Disease Dynamics

TB manifests differently across age groups and populations.
A single vaccine approach may not provide comprehensive protection.

Absence of Booster Immunization

Current immunization schedules do not include routine TB booster doses for older children and adults.

Measures Undertaken

India’s Domestic Initiatives

National TB Elimination Programme (NTEP)

India’s flagship programme focused on early detection, treatment, prevention, and surveillance.
Aims to eliminate TB ahead of global targets.

Promotion of Indigenous Diagnostic Technologies

Deployment of TrueNat and other molecular testing platforms has improved rapid diagnosis.

PreVenTB Vaccine Trial

Conducted across multiple sites involving thousands of household contacts of TB patients.
Demonstrated significant efficacy of VPM1002 and Immuvac against severe forms of TB, particularly EPTB.

International Efforts

WHO End TB Strategy

Targets drastic reductions in TB incidence and mortality worldwide.
Encourages universal access to diagnosis, treatment, and preventive care.

UN High-Level Commitments

Focus on increasing funding, research collaboration, and access to preventive therapies.

Global Vaccine Research Programmes

Several vaccine candidates are undergoing clinical evaluation.
Research continues to identify broader and longer-lasting protection.

Way Ahead

Accelerate Deployment of Indigenous Vaccines

Fast-track regulatory approvals for proven vaccine candidates.
Prioritize vulnerable populations and household contacts of TB patients.

Introduce Booster Vaccination Programmes

Consider integrating TB booster doses for school-age children and adolescents into national immunization schedules.

Strengthen Nutrition-Based Interventions

Expand nutritional support under schemes such as Nikshay Poshan Yojana.
Improve immunity among high-risk populations.

Enhance Early Detection Systems

Increase access to molecular diagnostics and digital screening technologies.
Focus on identifying latent and subclinical infections.

Adopt a Multi-Layered Prevention Strategy

Combine vaccination, nutrition support, early diagnosis, and preventive therapy for maximum impact.

Conclusion

India’s progress toward TB elimination requires a combination of scientific innovation and strong public health interventions. The encouraging results from indigenous vaccine trials highlight the potential of locally developed solutions to reduce the burden of both pulmonary and extrapulmonary tuberculosis. By integrating new vaccines with improved diagnostics, nutrition support, and preventive care, India can significantly accelerate its journey toward a TB-free future.

Source : The Hindu