Only two diseases have been fully eradicated from the planet: smallpox in humans and rinderpest in animals. That’s it. Despite more than a century of global health campaigns, those are the only two infections that have been wiped out worldwide and no longer require ongoing prevention efforts. A handful of other diseases are close, and several more have been eliminated from specific countries or regions, but true global eradication remains extraordinarily rare.
What “Eradicated” Actually Means
Eradication is a specific, binary designation. It means zero human cases anywhere on Earth, no natural reservoir for the organism, and absolute containment of any remaining infectious material. Once a disease is eradicated, vaccination and control programs can stop because there is nothing left to protect against. This is what separates eradication from two related but different concepts.
Elimination means transmission has been interrupted in a specific country or region, but the disease still exists elsewhere. A country that eliminates malaria, for example, must keep monitoring and responding to imported cases or risk the disease returning. Control means reducing a disease’s impact through ongoing interventions like vaccination or mosquito spraying, without stopping transmission entirely. Both elimination and control require continuous investment. Eradication is permanent.
Smallpox: The Only Human Disease Eradicated
Smallpox was certified as eradicated by an independent committee of experts in December 1979, with the World Health Organization formally ratifying the announcement in 1980. It remains the only human infectious disease ever eradicated. The virus killed an estimated 300 million people in the 20th century alone before a global vaccination campaign, built on a strategy of surveillance and ring vaccination (vaccinating everyone around each new case), brought it to zero.
Several features made smallpox a good candidate. It had no animal reservoir, meaning it could only survive by spreading between people. Infected individuals developed a visible rash, making cases easy to identify. And the vaccine was highly effective, heat-stable, and could be administered with a simple bifurcated needle. Even so, the campaign took over a decade of intense, coordinated effort across every continent.
Rinderpest: The Only Animal Disease Eradicated
Rinderpest, a devastating viral disease of cattle and other cloven-hoofed animals, was declared eradicated in May and June 2011 by the World Organisation for Animal Health and the Food and Agriculture Organization. It is the only animal disease to have been wiped out globally. Rinderpest caused massive livestock die-offs across Africa, Asia, and Europe for centuries, leading to famine and economic collapse in affected regions. A coordinated vaccination and surveillance campaign that spanned decades finally ended transmission.
Wild Poliovirus Types 2 and 3
While polio as a whole has not been eradicated, two of its three wild virus types have been. Wild poliovirus type 2 was declared eradicated in September 2015, with the last detected case traced back to India in 1999. Wild poliovirus type 3 was declared eradicated in October 2019. Only wild poliovirus type 1 continues to circulate, confined to a small number of cases in Pakistan and Afghanistan.
The situation is complicated by vaccine-derived poliovirus, which can emerge in under-vaccinated communities where the weakened virus in the oral vaccine mutates back toward a form that causes paralysis. So even though two of the three wild types are gone, the broader polio eradication effort is not finished.
Guinea Worm Disease: The Closest to Eradication
Dracunculiasis, better known as Guinea worm disease, is the disease closest to becoming the next one eradicated. In 1986, an estimated 3.5 million people were infected annually. In 2024, the entire world reported just 15 human cases, split between Chad (nine cases) and South Sudan (six cases). During the first half of 2025, only a single human case was reported. That represents a reduction of more than 99.99% over four decades.
Guinea worm has no vaccine and no treatment. Eradication has relied entirely on behavioral interventions: filtering drinking water, treating water sources with larvicide, and containing infected individuals to prevent the parasite from completing its life cycle. The remaining challenge is animal infections, particularly in dogs in Chad. In 2024, 664 animal infections were reported, and 550 were reported in just the first half of 2025. Until the animal transmission cycle is fully understood and interrupted, final eradication remains out of reach.
Diseases Eliminated Regionally but Not Eradicated
Several diseases have been eliminated from individual countries without being eradicated globally. Malaria is the most prominent example. The WHO certifies countries as malaria-free after they demonstrate at least three consecutive years of zero locally acquired cases. Recent certifications include Cabo Verde and Egypt in 2024, Georgia, Suriname, and Timor-Leste in 2025, and Azerbaijan and Belize in 2023. China achieved certification in 2021. But malaria still kills hundreds of thousands of people annually, overwhelmingly in sub-Saharan Africa. These are elimination successes, not steps toward global eradication.
Measles, rubella, and maternal and neonatal tetanus have also been eliminated from various countries and regions through vaccination, though all three continue to circulate globally.
Diseases Considered Potentially Eradicable
The International Task Force for Disease Eradication reviewed 94 diseases and concluded that six could likely be eradicated with existing tools: Guinea worm disease, polio, mumps, rubella, lymphatic filariasis (a parasitic infection spread by mosquitoes that causes severe swelling in the limbs), and pork tapeworm infection. Each has characteristics that make eradication theoretically possible, such as no animal reservoir or the availability of effective vaccines or treatments.
In practice, though, “potentially eradicable” and “likely to be eradicated soon” are very different things. Mumps and rubella lack sufficient data on their burden in developing countries. Lymphatic filariasis needs better tools for monitoring infection levels. And yaws, a bacterial skin infection targeted by the WHO for eradication by 2030, faces its own obstacles: many previously endemic countries don’t even know their current infection status, the bacteria can hide as asymptomatic latent infections, and antibiotic resistance is an emerging concern.
Eradication Campaigns That Failed
The history of disease eradication is mostly a history of failure. The first serious attempt began in 1909, when the Rockefeller Foundation launched a global campaign against hookworm. Over 15 years, programs operated in 52 countries across six continents, screening and treating infected people while promoting sanitary latrines. A decade in, evaluations found that individual infections were less severe, but the proportion of people infected hadn’t changed. The campaign shifted to control rather than eradication.
Yellow fever was the next target, starting in Latin America in 1918. The strategy focused on eliminating breeding sites of the mosquito that carried the virus. Yellow fever nearly disappeared from the Americas within a decade, but then scientists discovered that monkeys also harbored the virus, creating a wildlife reservoir that made eradication impossible with available tools.
The most ambitious failure was the WHO’s global malaria eradication campaign, launched in 1955. It relied heavily on DDT to kill mosquitoes. Initial results were dramatic, but by the late 1960s, programs were being scaled back, international funding dried up, and malaria came roaring back in many countries. The campaign was formally abandoned, replaced by a more modest goal of control.
These failures highlight why eradication is so difficult. A disease needs to have no animal reservoir, reliable diagnostic tools, an effective and deliverable intervention, and sustained political and financial commitment across every affected country for as long as it takes. When any of those pieces is missing, eradication stalls and the disease persists.