Tuberculosis (TB) remains the world’s leading infectious killer, claiming nearly 1.3 million lives in 2022, despite being a curable disease. The World Health Organization (WHO) reports that while progress has been made, the COVID-19 pandemic reversed years of gains, disrupting access to essential TB services and pushing the world off track to meet its targets.
For decades, the primary strategy for TB control has relied on individuals seeking care and providing a sputum sample for testing. But this approach misses millions – those with mild or no symptoms, those facing barriers to healthcare, and those living in communities where access is limited. Addressing this gap in TB detection is now within reach thanks to advances in technology and a growing recognition that active case-finding is essential, even in resource-constrained settings.
The challenge isn’t a lack of effective treatment; it’s finding the cases. Current symptom-based approaches are simply insufficient in areas with high TB transmission rates. A shift is underway, moving away from waiting for people to get sick enough to seek help, and toward proactively finding TB in communities, regardless of whether individuals are exhibiting symptoms.
Reaching Communities Directly: Lessons from Papua New Guinea
Papua New Guinea (PNG) faces a particularly high burden of TB, including a growing proportion of drug-resistant strains. Access to timely diagnosis is uneven, especially in remote areas. On Daru Island, in PNG’s Western Province, the Burnet Institute, in collaboration with local partners, has demonstrated the impact of a comprehensive, community-based approach. Their model, known as SWEEP TB, is straightforward: test everyone and treat those who test positive.
This initiative combines community engagement with active case finding, utilizing mobile digital X-ray units to reach people where they live, and work. The results have been significant, identifying many previously undiagnosed cases and demonstrating the potential of moving screening out of traditional healthcare facilities. Similar work in East New Britain province has expanded testing to workplaces, simultaneously screening for related conditions like diabetes and hypertension, recognizing the interconnectedness of health challenges.
New Tools for Faster, Easier Detection
While mobile screening units have proven effective, their cost and logistical complexity limit scalability. Expanding TB detection requires simpler, more adaptable tools. One promising development, recently endorsed by the WHO, is a tongue swab test as an alternative to sputum collection. The Burnet Institute announced this endorsement, highlighting its potential to reach populations who struggle to produce sputum – including children, people living with HIV, and those in the early stages of the disease.
This portable, battery-operated test will be piloted in PNG, integrated into everyday settings like transport hubs, markets, and even in-home screenings. Alongside this, advances in portable digital X-ray, coupled with artificial intelligence (AI) for rapid image interpretation, are accelerating large-scale screening efforts. These technologies are most effective when combined with strong community engagement and the involvement of local health workers.
Addressing Gaps in Vulnerable Populations
Certain groups remain particularly vulnerable to missed diagnoses. Pregnant women, for example, are often overlooked, despite having a higher TB burden than non-pregnant women. Symptoms can be absent or atypical, making symptom-based screening unreliable, and standard diagnostics may be less sensitive. Researchers are exploring innovative solutions, such as digital stethoscopes combined with AI, to identify at-risk pregnant women in a safe and non-invasive manner. Integrating TB screening into routine antenatal care is crucial.
Beyond diagnosis, improving treatment monitoring is as well essential. Currently, assessing a patient’s response to treatment can be leisurely and imprecise. Developing a test that combines laboratory data with clinical observations to provide early insights into treatment effectiveness would allow for timely adjustments and improved outcomes.
The Path Forward: Policy and Investment
Eliminating TB won’t be achieved through a single breakthrough, but through sustained investment in practical, scalable solutions. This requires a fundamental shift in policy, recognizing that active case-finding is no longer a luxury, but a necessity, regardless of setting. On World TB Day, the focus must be on bringing diagnosis closer to communities, investing in accessible tools, and ensuring that no one is left behind.
The right policy choices, coupled with targeted investment, can make TB elimination a reality, not just in wealthier nations, but everywhere. The next key step will be evaluating the results of the tongue swab pilot program in PNG and scaling up successful interventions based on the data collected. Further updates on the program’s progress will be available through the Burnet Institute website.
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