The World Health Organization has validated Timor-Leste as having eliminated trachoma as a public health problem.
The result has a wider regional significance: Timor-Leste was the last country in WHO's South-East Asia Region where trachoma was still suspected to be endemic. Its validation therefore means trachoma is no longer considered a public-health problem anywhere in the region.
What trachoma is
Trachoma is an eye disease caused by repeated infection with the bacterium Chlamydia trachomatis.
Repeated infections can scar the inside of the eyelid. In advanced disease, the eyelashes turn inward and scrape the cornea, a condition called trichiasis. Without treatment, that repeated injury can lead to irreversible blindness.
WHO describes trachoma as the world's leading infectious cause of blindness.
What the evidence showed
WHO's validation followed several years of surveillance and targeted investigation.
Between 2015 and 2017, investigators examined children on Atauro Island, screened patients attending eye clinics across the country and conducted targeted house-to-house searches. WHO reports that no trachoma was found in those investigations.
Timor-Leste then generated additional evidence. In a 2025 survey, 4,949 samples from children aged 1–5 years were analysed across all 13 municipalities. WHO says the testing found no evidence of transmission at a level requiring trachoma-specific public-health intervention.
Elimination does not mean surveillance stops
Public-health elimination is different from biological eradication.
Timor-Leste must retain the ability to detect and manage future cases, including trichiasis. WHO says specialised eye-care services and trichiasis surgery will remain available, while trachoma surveillance will be incorporated into broader disease-surveillance systems.
The country is also continuing work on safe water, sanitation and hygiene, which are important because trachoma transmission is associated with poor access to these basic services.
Why the regional milestone matters
Timor-Leste is the 33rd country worldwide validated by WHO for eliminating trachoma as a public health problem and the fourth country in WHO's South-East Asia Region to reach the milestone.
The broader lesson is that elimination is rarely the result of one intervention. It depends on surveillance, eye-care services, sanitation, case finding and the ability to maintain those systems after incidence falls.
For preventable blindness, that last step matters: once a disease becomes uncommon, the risk is that detection systems weaken before transmission risk has fully disappeared.
Primary source
- World Health Organization. WHO validates Timor-Leste’s elimination of trachoma as a public health problem. 3 September 2026. https://www.who.int/news/item/03-09-2026-who-validates-timor-leste-s-elimination-of-trachoma-as-a-public-health-problem