Guinea Worm Nears Historic Defeat as Global Cases Fall to Single Digits

A disease that once afflicted millions each year is now barely hanging on. In 2025, only 10 human cases of Guinea worm disease were reported globally, marking the lowest figure ever recorded and bringing the parasite to the brink of eradication.

The provisional data were released by the Carter Center, the U.S.-based organisation that has led the international eradication campaign for decades. If successful, Guinea worm would become only the second human disease eliminated worldwide, after smallpox — an exclusive club with very strict entry requirements.

Guinea worm disease, formally known as dracunculiasis, spreads through drinking water contaminated with parasite larvae. Months after infection, sufferers develop painful blisters from which a worm slowly emerges, often from the leg. There is no vaccine, no medication to cure it, and no quick relief — only prevention.

Global progress has been dramatic. When eradication efforts intensified in the mid-1980s, the disease caused an estimated 3.5 million infections every year. Today, transmission has been pushed to the margins of a handful of countries, largely through relentless surveillance, clean-water initiatives and community education.

Of the 10 cases recorded in 2025, two occurred in South Sudan, while Chad and Ethiopia each reported four. Several countries that had struggled with the disease in the past — including Angola, Cameroon, the Central African Republic and Mali — reported zero human cases for a second year running, an important milestone under international certification rules.

To be officially declared eradicated, every country must demonstrate the absence of both human and animal infections for at least three consecutive years, even in places where the disease was never endemic. So far, 200 countries and territories have been certified free of Guinea worm by the World Health Organization. Six countries remain in the final stretch of the process.

The strategy behind the success is strikingly low-tech. Because there is no treatment, prevention has focused on safe water access: protected wells, boreholes, household filters and rapid detection of new cases. Breaking the transmission cycle is critical, as infected individuals often seek relief by placing affected limbs in water, which can release parasite larvae and contaminate drinking sources.

Guinea worm is not the only neglected disease inching toward extinction. The World Health Organization is also targeting yaws — a bacterial infection that primarily affects children — for eradication by 2030. Unlike Guinea worm, yaws can be cured with antibiotics, and progress has accelerated sharply in recent years.

Still, health officials caution against premature celebration. Eradication requires absolute zero, sustained over time, and history shows that the final cases are often the hardest to eliminate. For Guinea worm, the finish line is finally visible — but the race isn’t over yet.