Summary of Key Points
Bangladesh is one of the countries with the highest burden of tuberculosis in the world (ranking sixth globally, with approximately 44,000 deaths per year from the disease). However, traditional diagnostic methods either have high rates of missed diagnoses (such as sputum smear tests) or are expensive and complex (molecular testing), resulting in many patients receiving delayed treatment or going undetected. The tongue swab tuberculosis testing product developed by the Chinese company Pusilihua has been included in the World Health Organization (WHO) guidelines due to its simplicity of use, low cost, fast results (available in half an hour), and the fact that it does not require sputum. It has also received support from the Global Fund for promotion in 13 countries, including Bangladesh. The product is currently being validated by local institutions and holds promise in solving the challenges of tuberculosis diagnosis in the country, thereby aiding in prevention and control efforts.
I. Tuberculosis in Bangladesh: A More Lethal “Hidden Killer” than Measles
The tuberculosis problem in Bangladesh is more severe than the recent measles outbreak: According to WHO data, around 44,000 people die from tuberculosis each year (120 per day), and the country has the sixth-highest number of cases globally. Approximately 18% of the 384,000 patients are unaware that they have the disease, posing a significant risk of transmission.
- Patient Dilemmas: Not many patients are as fortunate as carpenter Mohammed, who was advised by his knowledgeable boss to go to a free hospital. Many patients, being the main breadwinners in their families, endure their illness or receive missed or misdiagnosed treatments at small clinics.
- Transmission Hotspots: The country’s dense population (180 million people living in 1% of Russia’s land area), poor ventilation in workshops, and environmental pollution facilitate the spread of tuberculosis through droplets.
II. Traditional Diagnostic Methods: Either Miss Diagnoses or Are Unaffordable
Tuberculosis diagnosis has always been a challenge, with two major issues in Bangladesh:
1. Sputum Smear Tests: These are inexpensive but unreliable—this 19th-century technique relies on microscopes to detect bacteria in sputum. About half of the patients do not produce enough sputum, and the high rate of missed diagnoses delays treatment.
2. Molecular Testing: More accurate but expensive and time-consuming—the GeneXpert equipment used in large hospitals costs $10,000, and each testing kit costs $8. Local clinics must send samples to larger cities for analysis, which takes several days. The financial pressure on the government, coupled with reduced international aid, makes it impossible to cover all areas.
In the words of a Gates Foundation expert: Traditional testing methods require cold chains, electricity, laboratories, and specialized personnel, which are often unavailable in many regions, turning what could be a preventable and treatable disease into the “number one infectious killer.”
III. The Chinese Tongue Swab: A Revolutionary Solution
Pusilihua’s tongue swab product is the only tool that meets WHO guidelines. Its advantages make it perfectly suited for Bangladesh:
- No Need for Sputum: If there is no sputum, simply wipe the back of the tongue with the swab; if there is sputum, the swab can still provide accurate results, reducing patient discomfort.
- Compact and Affordable Equipment: The testing device is the size of a palm and costs $150 (compared to the $10,000 for GeneXpert). It is easy to operate—anyone can learn how to use it after watching a video, and results are available in half an hour.
- Versatile: It can be powered by batteries or chargers, making it suitable for remote areas without access to electricity.
In short, local clinics can perform the tests, allowing patients to receive results on the same day at a lower cost.
IV. International Recognition and Validation: How a Chinese Product Reached Global Markets
The rapid adoption of this product in Bangladesh is thanks to international support:
1. WHO Approval: In February 2026, the WHO included tongue swab testing in its tuberculosis guidelines for the first time, giving the product official recognition.
2. Global Fund Promotion: The Global Fund, the largest contributor to tuberculosis control efforts, announced the promotion of this product in 13 countries in June, providing 300,000 units to Bangladesh for testing in 83 remote areas where only sputum smear tests were previously used.
3. Multi-Layered Validation: A team from the International Centre for Diarrhoeal Disease Research (ICDDR,B) is verifying the accuracy of the tongue swab compared to existing methods, especially in children and port communities. The funding for this validation comes from the “Partnership Against Tuberculosis,” ensuring neutrality.
4. Gates Foundation Support: Since 2024, the Gates Foundation has assisted Pusilihua with development, clinical trials, and WHO certification, helping to bring this Chinese innovation to a global scale.
V. More Than Just a Testing Tool: A Potential Game-Changer for Tuberculosis Control in Bangladesh
The value of this product goes beyond rapid testing:
- For Patients: Early detection and treatment can prevent patients from enduring the disease or receiving misdiagnoses, increasing the chances of successful outcomes like in Mohammed’s case.
- For the Healthcare System: By bringing testing to grassroots clinics, costs are reduced, allowing more resources to be allocated for patient treatment.
- For Prevention and Control: Prompt identification of hidden cases helps limit the spread of tuberculosis, ultimately contributing to its control in Bangladesh.
As researchers emphasize, the true value of a technology lies not in the day it is introduced but in its daily use, validation, and continuous improvement. This Chinese-developed tongue swab may indeed play a crucial role in helping Bangladesh combat tuberculosis.