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Jimmy Carter took great pride in pointing out that the United States 

 during his term as president. But after he left office he launched a war against "neglected" diseases — diseases in far-off lands that most Americans will never suffer from and may not have even heard of. Diseases like lymphatic filariasis, trachoma, river blindness, schistosomiasis ... and a nasty little bug called Guinea worm disease.

Guinea worms are spread through contaminated drinking water and eating undercooked fish. The female worms, which can be up to 3 feet long once they mature, cause incredibly painful, open blisters usually on the infected person's lower legs and feet – through which the worms emerge. It can take a toll for weeks or months, and sometimes permanently, leaving the individual unable to support a family.

And if someone with Guinea worm has contact with water – perhaps to cool the burning pain caused by the worm's emergence – the worm will release tens of thousands of baby worms, contaminating the whole body of water.

The effort to end this disease did not rely on high-tech methods. Kelly Callahan, a public health worker who spent years fighting Guinea worm disease in southern Sudan with the Carter Center, says: "Guinea worm disease has no cure, no vaccination, basically the entire eradication effort is built on behavior change."

That's meant teaching people in vulnerable areas to filter their water and giving them the low-cost tools to do so. 

Other strategies included providing access to safe water supplies; better detection of human and animal cases; cleaning and bandaging of wounds; preventing infected people and animals from wading into water and the use of a larvicide to kill the worms.  

Because of Carter, the world has come incredibly close to wiping out Guinea worm.

"I would like to see Guinea worm completely eradicated before I die," Carter said at a press conference in 2015. "I'd like for the last Guinea worm to die before I do. I think right now we have 11 cases. We started out with 3.6 million cases."

And it did look as if the last Guinea worm 

 going to die before the 39th U.S. president. Then a few years ago, scientists discovered that the parasite was spreading among stray dogs in Chad – and that baboons in Ethiopia were also carrying the parasite. This long-overlooked reservoir of the worms was a setback for the global eradication program and showed that killing the last guinea worm was going to be harder than previously thought.

What's more, as the number of cases has dwindled, new challenges have emerged. 

In 2018, Guinea worm disease was found in Angola, a country not known to have cases in the past.

As a result, in 2019 the World Health Organization pushed back its expected eradication date for the disease a full decade from 2020 to 2030. 

Researchers are now looking for a treatment for infected dogs, and public health workers have turned to new interventions, like paying people cash to report infected animals. 

Nonetheless, Carter's campaign has been remarkably successful.

In an interview with NPR in 2015, Carter recalled the origins of his crusade. Carter's former drug czar, Peter Borne, was working on a U.N. initiative called the "Freshwater Decade." Borne came to the Carter Center to talk about overlooked diseases spread from "drinking bad water." One of them was Guinea worm.

"The main reason he [Borne] came to the Carter Center was because he couldn't get anyone else to tackle this problem," Carter recalled. "It's a despicable disease. And it was in such remote villages that no one wanted to take on the task. So we decided to take it on." That was in 1986.

The late Dr. Paul Farmer, founder of Partners in Health and a champion of global health causes, spoke to NPR in 2019 about Carter's efforts. Farmer said that the former president deserves much of the credit for pushing Guinea worm to the brink of extinction.

Smallpox, Farmer said, is "the only human disease [that's] ever been eradicated. And if ... Guinea worm is right behind, that's going to be thanks to Carter. I mean, there were millions of cases when he got involved in, you know, after his presidency in the mid-80s. And now we are down to fewer than a hundred last year." In 2022, the Carter Center reports there were only 13 recorded human cases of the disease, a provisional number that will be officially confirmed, likely in March.

Carter was relentless in demanding that people pay attention to diseases that primarily affect poor people in remote parts of the world. And that's a tremendous challenge. It's not easy to keep people committed to action at every level of an eradication drive, Farmer says.

"When you take on a problem like this, like Guinea worm, you have to sweet talk the ministry officials, the political figures, the nurses, the doctors, the community activists, the farmers, the people who are ... most at risk. Carter's had to sweet talk all those people. And that's something that's been very inspiring to many of us."

 is adjunct professor of medicine at the University of Maryland School of Medicine. He agrees that Carter's advocacy has helped governments and public health agencies around the world stay focused on eradicating Guinea worm disease. 

, too, investing about $500 million dollars since 1986. 

"I think we should be optimistic that it is achievable," says Plowe. "I think we shouldn't be overly optimistic about how quick it's gonna be."

Guinea worm was just one of the targets of Carter's war. Onchocerciasis, also known as 

, has been eliminated from most of the Americas and dramatically reduced in Africa due to the work of Carter and the Carter Center.

Major inroads have also been made against other neglected diseases including 

 which causes horrific swelling of the legs and genitals.

Those who know Carter well say it was his upbringing in an impoverished part of the South that left him with a strong sense of self-reliance, self-sacrifice and a duty to help others.

Born in Plains, Georgia, in 1924, he stayed close to his roots, returning home after his Navy career to run the family's peanut farm. 

Church was a central part of his life in Plains – he taught Sunday school there into his 90s — and friends say his Christian faith drove him.

"He did what he did out of a love for mankind," says 

, one of the co-founders of Habitat for Humanity, which counted Jimmy and Rosalynn Carter among their many volunteers, hammering nails by day and sleeping in bunk beds by night. The Carters worked on Habitat projects in 14 countries. "He was a true, true humanitarian and a lot the drive comes from his Christian understanding of love," says Degelmann.

This week came the news this week that Carter has entered hospice care in his final days, but his death will not mean the end of his work. In a statement, the Carter Center has pledged to continue the fight to wipe out Guinea worm. 

When that scourge does come to an end, it will become one of Carter's signature achievements – an extraordinary accomplishment that reflects a simple yet profound tenet of his personal philosophy: "To try to help one another instead of being willing to go to war with one another." 

He recognized the difficulty of living up to this philosophy: "Getting along with one another and treating each other as equals is one of the hardest things to do on earth." And it's one of the things that Carter did best.

Sam Whitehead is a correspondent for Kaiser Health News who is based in Atlanta.

Health

Jason Beaubien

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Sam Whitehead

Carter targeted diseases primarily affecting the poor in remote areas — notably "Guinea worm disease." Because of his commitment, case numbers plummeted from 3.6 million a year to just 13 in 2022.

Jimmy Carter took on the awful Guinea worm when no one else would — and he triumphed

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