Trachoma: From Neglected Disease to Near Elimination

In the arid deserts of North Africa, the crowded river valleys of the Indus and Ganges, and the rural communities along China’s Yellow River, children have long suffered from a silent eye infection that gradually steals sight. The disease, known as trachoma, begins in early childhood with itching, irritation and watery discharge, and repeated infections scar the eyelids, eventually causing blindness.

What Is Trachoma?

Trachoma (Greek τράχωμα, “roughness”) is an infectious eye condition caused by the bacterium Chlamydia trachomatis serotypes A, B and C. Repeated infections scar the inner surface of the eyelid, leading to entropion—an inward turning of the lid that rubs lashes against the cornea and impairs vision.

Historical Context

Archaeological evidence shows trachoma‑related lesions on Australian Pleistocene skulls dating back to 8000 BC. Ancient Egyptian medical texts (the Ebers Papyrus, c. 1500 BC) recorded remedies for the disease, and Greek physicians such as Plato and Galen described its clinical features.

Did You Know? During Napoleon’s 1798 campaign in Egypt, soldiers spread trachoma across Europe, where it was called “Egyptian ophthalmia” or “military ophthalmia.”

Transmission Dynamics

The bacterium spreads through direct contact with infected eye secretions, especially among children, and via contaminated objects such as towels or clothing. Flies—particularly Musca sorbens, which breed in human feces—can mechanically transfer the bacteria when attracted to facial discharge.

Scientific Breakthroughs

In 1955 Chinese microbiologist Feifan Tang succeeded in isolating C. Trachomatis by cultivating the organism in chicken eggs, confirming the bacterial cause of trachoma. This discovery paved the way for antibiotic therapy.

Early mass‑treatment attempts with sulfonamides caused severe adverse reactions, and tetracycline eye ointment required prolonged, twice‑daily application, leading to poor compliance.

In 1993, researchers David Mabey and Robin Bailey demonstrated that a single oral dose of azithromycin was as effective as supervised tetracycline, and later multicenter trials showed community‑wide azithromycin distribution could surpass ointment‑based approaches.

Global Response: The SAFE Strategy

In 1993 the World Health Organization introduced the SAFE framework: Surgery to correct in‑turned lashes, Antibiotics to treat infection, Facial cleanliness to reduce spread, and Environmental improvements (clean water, latrines, waste management) to limit fly breeding.

International partnerships—including the WHO Alliance for the Global Elimination of Trachoma, Pfizer’s International Trachoma Initiative, and the International Coalition for Trachoma Control—have coordinated drug donations, surgical campaigns, and hygiene promotion across endemic regions.

Expert Insight: Samantha Carter notes that the SAFE strategy’s blend of medical, behavioral and infrastructural interventions makes it uniquely suited to address a disease rooted in poverty. By coupling antibiotics with long‑term water and sanitation upgrades, programs not only curb infection but also generate broader health and economic benefits for affected communities.

Progress Toward Elimination

World Health Organization data from April 2025 indicate that roughly 103 million people live in trachoma‑endemic districts, with about 1.9 million already experiencing vision loss. Since 2002, the number at risk has fallen from 1.5 billion to 136 million, a 92 percent reduction in prevalence reported in 2021.

As of November 2025, WHO has validated that 27 countries—including Benin, China, India and Kenya—have eliminated trachoma as a public health problem. The 2021–2030 Neglected Tropical Diseases roadmap now targets global elimination by 2030, extending the original 2020 goal.

Continued investment in hygiene promotion, latrine construction and eye‑care services could help close remaining gaps, especially in regions where clean water and sanitation remain limited.

Frequently Asked Questions

What bacterium causes trachoma?

Trachoma is caused by the bacterium Chlamydia trachomatis, specifically serotypes A, B and C.

How is trachoma transmitted?

The infection spreads through direct contact with eye secretions, contaminated objects (towels, clothing) and by flies such as Musca sorbens that are attracted to facial discharge, especially in settings lacking clean water, and sanitation.

What does the SAFE strategy entail?

SAFE stands for Surgery (to correct in‑turned eyelashes), Antibiotics (to treat infection), Facial cleanliness (to prevent spread) and Environmental improvement (clean water, latrines, waste management to reduce fly breeding).

What steps do you think are most critical for achieving a world free of trachoma?