posts: 26401
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| 26401 | Guinea worm disease is close to being eradicated – how was this progress achieved? | guinea-worm-path-eradication | post | publish | <!-- wp:columns --> <div class="wp-block-columns"><!-- wp:column --> <div class="wp-block-column"><!-- wp:paragraph --> <p>Guinea worm disease is a painful and debilitating disease that used to be common in Asia, the Middle East, and many countries in Africa. </p> <!-- /wp:paragraph --> <!-- wp:paragraph --> <p>It’s now close to being eradicated worldwide. This success is thanks to an eradication program that has focused on water treatment and filtration, public education, and providing safe sources of drinking water to reduce its spread.</p> <!-- /wp:paragraph --> <!-- wp:heading {"level":4} --> <h4>What is guinea worm disease?</h4> <!-- /wp:heading --></div> <!-- /wp:column --> <!-- wp:column --> <div class="wp-block-column"></div> <!-- /wp:column --></div> <!-- /wp:columns --> <!-- wp:columns --> <div class="wp-block-columns"><!-- wp:column --> <div class="wp-block-column"><!-- wp:paragraph --> <p>The disease is caused by a parasite called guinea worm (<em>Dracunculus medinensis</em>). The worm's larvae are carried by water fleas found in stagnant water in ponds, open wells, and freshwater lakes.</p> <!-- /wp:paragraph --> <!-- wp:paragraph --> <p>When someone drinks contaminated water, the larvae can invade their stomach and intestines. </p> <!-- /wp:paragraph --> <!-- wp:paragraph --> <p>Over time, they mature into adult worms – with female worms growing up to around a meter in length – and crawl through people's connective tissue, joints, and bones. This growth leads to arthritic conditions, which can debilitate people for months. Around one in two hundred infected people develop a permanent disability from the disease.{ref}Imtiaz, R., Hopkins, D. R., & Ruiz-Tiben, E. (1990). Permanent disability from dracunculiasis. <em>The Lancet</em>, <em>336</em>(8715), 630. https://doi.org/10.1016/0140-6736(90)93427-Q{/ref}</p> <!-- /wp:paragraph --> <!-- wp:paragraph --> <p>Around a year after the infection, the worm begins to emerge from the skin through a painful blister. This process also increases the risks of other infections.</p> <!-- /wp:paragraph --> <!-- wp:paragraph --> <p>People often try to find relief from the infection by putting their blisters in open water. This might bring some temporary relief for them but makes it harder to eliminate the disease. In the water, the worm can release its own larvae, and if the water contains water fleas, this restarts the life cycle of the guinea worm. </p> <!-- /wp:paragraph --> <!-- wp:paragraph --> <p>The disease can be treated with pain medication and antibiotics and by carefully removing the worm when it emerges.{ref}Biswas, G., Sankara, D. P., Agua-Agum, J., & Maiga, A. (2013). Dracunculiasis (guinea worm disease): eradication without a drug or a vaccine. <em>Philosophical Transactions of the Royal Society B: Biological Sciences</em>, <em>368</em>(1623), 20120146. <a href="https://doi.org/10.1098/rstb.2012.0146">https://doi.org/10.1098/rstb.2012.0146</a>Sankara, D.P., Korkor, A.S., Agua-Agum, J., Biswas, G. (2016). Dracunculiasis (Guinea Worm Disease). In: Gyapong, J., Boatin, B. (eds) Neglected Tropical Diseases - Sub-Saharan Africa. Neglected Tropical Diseases. Springer, Cham. <a href="https://doi.org/10.1007/978-3-319-25471-5_3">https://doi.org/10.1007/978-3-319-25471-5_3</a> {/ref}</p> <!-- /wp:paragraph --></div> <!-- /wp:column --> <!-- wp:column --> <div class="wp-block-column"></div> <!-- /wp:column --></div> <!-- /wp:columns --> <!-- wp:columns --> <div class="wp-block-columns"><!-- wp:column --> <div class="wp-block-column"><!-- wp:heading {"level":4} --> <h4>Guinea worm disease used to be common</h4> <!-- /wp:heading --></div> <!-- /wp:column --> <!-- wp:column --> <div class="wp-block-column"></div> <!-- /wp:column --></div> <!-- /wp:columns --> <!-- wp:columns --> <div class="wp-block-columns"><!-- wp:column --> <div class="wp-block-column"><!-- wp:paragraph --> <p>This parasite has troubled humans for a long time. There are records of guinea worm disease dating back thousands of years.{ref}Watts, S. (1998). An ancient scourge: the end of Dracunculiasis in Egypt. <em>Social Science & Medicine</em>, <em>46</em>(7), 811–819. <a href="https://doi.org/10.1016/S0277-9536(97)00213-X">https://doi.org/10.1016/S0277-9536(97)00213-X</a> {/ref}</p> <!-- /wp:paragraph --> <!-- wp:paragraph --> <p>It was endemic in Asia, the Middle East, and much of Africa in the early twentieth century.{ref}Tayeh, A., Cairncross, S., & Cox, F. E. (2017). Guinea worm: from Robert Leiper to eradication. <em>Parasitology</em>, <em>144</em>(12), 1643-1648.{/ref}</p> <!-- /wp:paragraph --> <!-- wp:paragraph --> <p>It was common in poor, remote villages without <a href="https://ourworldindata.org/water-access">access to clean drinking water</a>. This was because sources of stagnant water – such as large open wells and ponds – could be contaminated by water fleas that contained guinea worm larvae.</p> <!-- /wp:paragraph --> <!-- wp:paragraph --> <p>Unfortunately, people do not develop immunity to the disease if they have been infected, which means it was common for people to be reinfected several times. For example, in the 1960s, in some villages in South India, more than 70% of adults infected once had been reinfected later on, and 10% had been infected at least 10 times.{ref}Reddy, C. R. R. M., Narasaiah, I. L., & Parvathi, G. (1969). Epidemiological studies on guinea-worm infection. Bulletin of the World Health Organization, 40(4), 521. <a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2556107/pdf/bullwho00225-0041.pdf">https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2556107/pdf/bullwho00225-0041.pdf</a> {/ref}</p> <!-- /wp:paragraph --> <!-- wp:paragraph --> <p>By the 1980s, guinea worm disease was known to be endemic in 20 countries in South Asia and parts of Africa. We see this in the map, which shows the number of reported cases by country in 1989.</p> <!-- /wp:paragraph --> <!-- wp:paragraph --> <p>In 1986, around 35,000 cases were reported to the World Health Organization (WHO). As surveillance improved, detected cases increased to 890,000 in 1989.</p> <!-- /wp:paragraph --></div> <!-- /wp:column --> <!-- wp:column --> <div class="wp-block-column"><!-- wp:html --> <iframe src="https://ourworldindata.org/grapher/number-of-reported-guinea-worm-dracunculiasis-cases?tab=map&time=1989" loading="lazy" style="width: 100%; height: 600px; border: 0px none;"></iframe> <!-- /wp:html --></div> <!-- /wp:column --></div> <!-- /wp:columns --> <!-- wp:columns --> <div class="wp-block-columns"><!-- wp:column --> <div class="wp-block-column"><!-- wp:heading {"level":4} --> <h4>How can guinea worm disease be prevented?</h4> <!-- /wp:heading --></div> <!-- /wp:column --> <!-- wp:column --> <div class="wp-block-column"></div> <!-- /wp:column --></div> <!-- /wp:columns --> <!-- wp:columns --> <div class="wp-block-columns"><!-- wp:column --> <div class="wp-block-column"><!-- wp:paragraph --> <p>Unfortunately, there are no vaccines against guinea worm disease. </p> <!-- /wp:paragraph --> <!-- wp:paragraph --> <p>However, the disease has several features that make it easy to prevent. </p> <!-- /wp:paragraph --> <!-- wp:paragraph --> <p>First, humans are the main 'host' of the disease, with only a few exceptions.{ref}Molyneux, D., & Sankara, D. P. (2017). Guinea worm eradication: Progress and challenges—should we beware of the dog?. <em>PLoS Neglected Tropical Diseases</em>, <em>11</em>(4), e0005495.{/ref} The worm larvae are unable to survive for more than a few weeks in water fleas.{ref}Hopkins, D. R., & Ruiz-Tiben, E. (2011). Dracunculiasis (guinea worm disease): case study of the effort to eradicate guinea worm. <a href="https://www.cartercenter.org/resources/pdfs/news/health_publications/selendy-waterandsanitationrelateddiseases-chapt10.pdf">https://www.cartercenter.org/resources/pdfs/news/health_publications/selendy-waterandsanitationrelateddiseases-chapt10.pdf</a><br>Cleveland, C. A., Garrett, K. B., Box, E. K., Eure, Z., Majewska, A. A., Wilson, J. A., & Yabsley, M. J. (2020). Cooking copepods: The survival of cyclopoid copepods (Crustacea: Copepoda) in simulated provisioned water containers and implications for the Guinea Worm Eradication Program in Chad, Africa. <em>International Journal of Infectious Diseases</em>, <em>95</em>, 216-220.{/ref} This means the worms can easily die out if prevented from infecting humans.</p> <!-- /wp:paragraph --> <!-- wp:paragraph --> <p>That brings us to our second point: we know how to stop it from infecting people. When people avoid drinking contaminated water that contains water fleas and guinea worm larvae, they are prevented from being infected.</p> <!-- /wp:paragraph --> <!-- wp:paragraph --> <p>Third, the disease is seasonal. People infected in one season tend to release worms a year later, which restarts the seasonal cycle. In the past, when villages halted the spread of worms in a single season, the disease stopped entirely unless it was reintroduced from somewhere else.{ref}In dry climates, the disease is more common in rainy seasons when water accumulates in ponds and wells. In wet climates, the disease is more common in dry seasons when water is drying up and becoming stagnant.<br>Muller, R. (1979). Guinea worm disease: epidemiology, control, and treatment. <em>Bulletin of the World Health Organization</em>, <em>57</em>(5), 683.{/ref}</p> <!-- /wp:paragraph --></div> <!-- /wp:column --> <!-- wp:column --> <div class="wp-block-column"></div> <!-- /wp:column --></div> <!-- /wp:columns --> <!-- wp:columns --> <div class="wp-block-columns"><!-- wp:column --> <div class="wp-block-column"><!-- wp:heading {"level":4} --> <h4>The world has made huge progress against the disease</h4> <!-- /wp:heading --></div> <!-- /wp:column --> <!-- wp:column --> <div class="wp-block-column"></div> <!-- /wp:column --></div> <!-- /wp:columns --> <!-- wp:columns --> <div class="wp-block-columns"><!-- wp:column --> <div class="wp-block-column"><!-- wp:paragraph --> <p>The world has made tremendous progress in reducing the burden of this disease with the knowledge of how to prevent it from spreading.</p> <!-- /wp:paragraph --> <!-- wp:paragraph --> <p>The campaign to eradicate guinea worm disease began in the 1980s. It was led by a number of organizations including the Centers for Disease Control and Prevention in the United States (US CDC), the Carter Center, the WHO, and the United Nations Children's Fund (UNICEF).{ref}Hopkins, D. R., Ruiz-Tiben, E., Eberhard, M. L., Weiss, A., Withers, P. C., Roy, S. L., & Sienko, D. G. (2018). Dracunculiasis Eradication: Are We There Yet?. <em>The American journal of tropical medicine and hygiene</em>, <em>99</em>(2), 388–395. <a href="https://doi.org/10.4269/ajtmh.18-0204">https://doi.org/10.4269/ajtmh.18-0204</a> {/ref}</p> <!-- /wp:paragraph --> <!-- wp:paragraph --> <p>Village volunteers have played a major role in the eradication program. They provide people with water filters and larvicides, educate them about where to drink clean water, record cases, help treat patients who are suffering from the disease, and prevent them from releasing worms into the water.{ref}Hopkins, D. R., & Ruiz-Tiben, E. (2011). Dracunculiasis (guinea worm disease): case study of the effort to eradicate guinea worm. https://www.cartercenter.org/resources/pdfs/news/health_publications/selendy-waterandsanitationrelateddiseases-chapt10.pdf {/ref}</p> <!-- /wp:paragraph --> <!-- wp:paragraph --> <p>Another key driver of progress is access to improved drinking water sources, which has become more common in many countries.</p> <!-- /wp:paragraph --> <!-- wp:paragraph --> <p>You can see the change since the start of the eradication campaign in the chart. Cases of guinea worm disease declined rapidly across many countries. </p> <!-- /wp:paragraph --> <!-- wp:paragraph --> <p>Over 890,000 cases were recorded worldwide in 1989. By 2021, there were just 15. </p> <!-- /wp:paragraph --> <!-- wp:paragraph --> <p>Almost all of the 15 cases were recorded in Chad.</p> <!-- /wp:paragraph --></div> <!-- /wp:column --> <!-- wp:column --> <div class="wp-block-column"><!-- wp:html --> <iframe src="https://ourworldindata.org/grapher/number-of-reported-guinea-worm-dracunculiasis-cases?tab=chart&country=OWID_WRL~UGA~TCD~PAK~IND~MRT" loading="lazy" style="width: 100%; height: 600px; border: 0px none;"></iframe> <!-- /wp:html --></div> <!-- /wp:column --></div> <!-- /wp:columns --> <!-- wp:columns --> <div class="wp-block-columns"><!-- wp:column --> <div class="wp-block-column"><!-- wp:heading {"level":4} --> <h4>Which countries have eliminated guinea worm disease?</h4> <!-- /wp:heading --></div> <!-- /wp:column --> <!-- wp:column --> <div class="wp-block-column"></div> <!-- /wp:column --></div> <!-- /wp:columns --> <!-- wp:columns --> <div class="wp-block-columns"><!-- wp:column --> <div class="wp-block-column"><!-- wp:paragraph --> <p>In many countries, guinea worm disease has been completely eliminated.</p> <!-- /wp:paragraph --> <!-- wp:paragraph --> <p>Countries are certified as free of guinea worm disease if they have reported zero indigenous cases for at least three consecutive years while having active surveillance.{ref}They are certified by the International Commission for the Certification of Dracunculiasis Eradication (ICCDE), which was set up in 1995.<br><em>The International Commission for the Certification of Dracunculiasis Eradication – About us.</em> (n.d.). World Health Organization. Retrieved June 3, 2022, from https://www.who.int/groups/international-commission-for-the-certification-of-dracunculiasis-eradication/about{/ref}</p> <!-- /wp:paragraph --> <!-- wp:paragraph --> <p>On the map, you can see which countries are certified as being free of guinea worm disease. They are shown in blue. Using the timeline at the bottom of the chart you can see how each country’s status changed over time.</p> <!-- /wp:paragraph --> <!-- wp:paragraph --> <p>In 1996, 16 countries were known to be endemic for guinea worm disease. By 2021, only five countries remained endemic – Mali, Chad, South Sudan, Ethiopia, and Angola.</p> <!-- /wp:paragraph --></div> <!-- /wp:column --> <!-- wp:column --> <div class="wp-block-column"><!-- wp:html --> <iframe src="https://ourworldindata.org/grapher/progress-towards-guinea-worm-disease-eradication" loading="lazy" style="width: 100%; height: 600px; border: 0px none;"></iframe> <!-- /wp:html --></div> <!-- /wp:column --></div> <!-- /wp:columns --> <!-- wp:columns --> <div class="wp-block-columns"><!-- wp:column --> <div class="wp-block-column"></div> <!-- /wp:column --> <!-- wp:column --> <div class="wp-block-column"><!-- wp:owid/prominent-link {"linkUrl":"https://ourworldindata.org/grapher/year-country-was-certified-free-of-guinea-worm-disease","className":"is-style-thin"} /--></div> <!-- /wp:column --></div> <!-- /wp:columns --> <!-- wp:columns --> <div class="wp-block-columns"><!-- wp:column --> <div class="wp-block-column"><!-- wp:heading {"level":4} --> <h4>We are close to eradicating guinea worm disease, but challenges remain</h4> <!-- /wp:heading --></div> <!-- /wp:column --> <!-- wp:column --> <div class="wp-block-column"></div> <!-- /wp:column --></div> <!-- /wp:columns --> <!-- wp:columns --> <div class="wp-block-columns"><!-- wp:column --> <div class="wp-block-column"><!-- wp:paragraph --> <p>To eradicate guinea worm disease globally, there are several challenges we need to overcome.</p> <!-- /wp:paragraph --> <!-- wp:paragraph --> <p>A general challenge is that it takes around a year after infection for the worm to emerge from a person's body. This is why countries need to monitor for new cases for several years after they have reported zero cases, in order to achieve certification.</p> <!-- /wp:paragraph --> <!-- wp:paragraph --> <p>Another problem is that a few countries, such as Chad and Ethiopia, have recently had outbreaks linked to dogs infected with the worms, which had not been seen before. That means extra efforts have been needed in recent years to prevent infections in dogs in those regions.{ref}Molyneux, D., & Sankara, D. P. (2017). Guinea worm eradication: Progress and challenges—should we beware of the dog?. <em>PLoS Neglected Tropical Diseases</em>, <em>11</em>(4), e0005495.<br>Hopkins, D. R., Ruiz-Tiben, E., Eberhard, M. L., Weiss, A., Withers, P. C., Roy, S. L., & Sienko, D. G. (2018). Dracunculiasis Eradication: Are We There Yet? <em>The American Journal of Tropical Medicine and Hygiene</em>, <em>99</em>(2), 388–395. <a href="https://doi.org/10.4269/ajtmh.18-0204">https://doi.org/10.4269/ajtmh.18-0204</a> {/ref}</p> <!-- /wp:paragraph --> <!-- wp:paragraph --> <p>Finally, it has been difficult to eliminate guinea worm disease in countries with violence and conflict, where healthcare workers are less able to treat and prevent infections.{ref}Kelly-Hope, L. A., & Molyneux, D. H. (2021). Quantifying conflict zones as a challenge to certification of Guinea worm eradication in Africa: a new analytical approach. <em>BMJ open</em>, <em>11</em>(8), e049732.<br>In some cases, the eradication effort has worked around conflicts or addressed them. For example, in 1995, former US president Jimmy Carter was involved in negotiating a ceasefire during the Second Sudanese Civil War, to allow healthcare workers to begin efforts to eradicate guinea worm disease in the region.<br>Hopkins, D. R., & Ruiz-Tiben, E. (2011). Dracunculiasis (guinea worm disease): case study of the effort to eradicate guinea worm. <a href="https://www.cartercenter.org/resources/pdfs/news/health_publications/selendy-waterandsanitationrelateddiseases-chapt10.pdf">https://www.cartercenter.org/resources/pdfs/news/health_publications/selendy-waterandsanitationrelateddiseases-chapt10.pdf</a> {/ref}</p> <!-- /wp:paragraph --> <!-- wp:paragraph --> <p>Despite these challenges, there has been a massive decline in guinea worm cases over time. Only 13 cases were reported globally in 2022. The world is so close to the goal and with dedicated effort, we may soon achieve it. After thousands of years, the entire world may soon be free of this debilitating disease.</p> <!-- /wp:paragraph --></div> <!-- /wp:column --> <!-- wp:column --> <div class="wp-block-column"></div> <!-- /wp:column --></div> <!-- /wp:columns --> <!-- wp:separator --> <hr class="wp-block-separator"/> <!-- /wp:separator --> <!-- wp:paragraph --> <p><em><strong>Keep reading on Our World in Data:</strong></em></p> <!-- /wp:paragraph --> <!-- wp:owid/prominent-link {"title":"Clean Water","linkUrl":"https://ourworldindata.org/water-access","className":"is-style-thin"} --> <!-- wp:paragraph --> <p></p> <!-- /wp:paragraph --> <!-- /wp:owid/prominent-link --> <!-- wp:owid/prominent-link {"linkUrl":"https://ourworldindata.org/polio","className":"is-style-thin"} --> <!-- wp:paragraph --> <p></p> <!-- /wp:paragraph --> <!-- /wp:owid/prominent-link --> <!-- wp:paragraph --> <p><strong>Acknowledgments:</strong> Hannah Ritchie and Max Roser provided very helpful guidance and comments that helped improve this post.</p> <!-- /wp:paragraph --> | {
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"text": "(4), e0005495.{/ref} The worm larvae are unable to survive for more than a few weeks in water fleas.{ref}Hopkins, D. R., & Ruiz-Tiben, E. (2011). Dracunculiasis (guinea worm disease): case study of the effort to eradicate guinea worm. ",
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"text": "Cleveland, C. A., Garrett, K. B., Box, E. K., Eure, Z., Majewska, A. A., Wilson, J. A., & Yabsley, M. J. (2020). Cooking copepods: The survival of cyclopoid copepods (Crustacea: Copepoda) in simulated provisioned water containers and implications for the Guinea Worm Eradication Program in Chad, Africa. ",
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"title": "Guinea worm disease is close to being eradicated \u2013 how was this progress achieved?",
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"excerpt": "In the late 1980s, there were near a million new cases of guinea worm disease recorded worldwide. In 2021, there were only 15. How was this achieved?",
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2022-07-07 09:00:00 | 2024-02-16 14:22:53 | 1ZGKUXlb0RBlR5QJaEOzNq2rsIG2243r1fYUzg-ApHOs | [
"Saloni Dattani",
"Fiona Spooner"
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In the late 1980s, there were near a million new cases of guinea worm disease recorded worldwide. In 2021, there were only 15. How was this achieved? | 2019-10-30 14:35:03 | 2023-11-27 10:20:46 | https://ourworldindata.org/wp-content/uploads/2018/10/Guinea-worm-eradication-thumbnail.png | {} |
Guinea worm disease is a painful and debilitating disease that used to be common in Asia, the Middle East, and many countries in Africa. It’s now close to being eradicated worldwide. This success is thanks to an eradication program that has focused on water treatment and filtration, public education, and providing safe sources of drinking water to reduce its spread. ## What is guinea worm disease? The disease is caused by a parasite called guinea worm (_Dracunculus medinensis_). The worm's larvae are carried by water fleas found in stagnant water in ponds, open wells, and freshwater lakes. When someone drinks contaminated water, the larvae can invade their stomach and intestines. Over time, they mature into adult worms – with female worms growing up to around a meter in length – and crawl through people's connective tissue, joints, and bones. This growth leads to arthritic conditions, which can debilitate people for months. Around one in two hundred infected people develop a permanent disability from the disease.{ref}Imtiaz, R., Hopkins, D. R., & Ruiz-Tiben, E. (1990). Permanent disability from dracunculiasis. _The Lancet_, _336_(8715), 630. https://doi.org/10.1016/0140-6736(90)93427-Q{/ref} Around a year after the infection, the worm begins to emerge from the skin through a painful blister. This process also increases the risks of other infections. People often try to find relief from the infection by putting their blisters in open water. This might bring some temporary relief for them but makes it harder to eliminate the disease. In the water, the worm can release its own larvae, and if the water contains water fleas, this restarts the life cycle of the guinea worm. The disease can be treated with pain medication and antibiotics and by carefully removing the worm when it emerges.{ref}Biswas, G., Sankara, D. P., Agua-Agum, J., & Maiga, A. (2013). Dracunculiasis (guinea worm disease): eradication without a drug or a vaccine. _Philosophical Transactions of the Royal Society B: Biological Sciences_, _368_(1623), 20120146. [https://doi.org/10.1098/rstb.2012.0146](https://doi.org/10.1098/rstb.2012.0146)Sankara, D.P., Korkor, A.S., Agua-Agum, J., Biswas, G. (2016). Dracunculiasis (Guinea Worm Disease). In: Gyapong, J., Boatin, B. (eds) Neglected Tropical Diseases - Sub-Saharan Africa. Neglected Tropical Diseases. Springer, Cham. [https://doi.org/10.1007/978-3-319-25471-5_3](https://doi.org/10.1007/978-3-319-25471-5_3) {/ref} ## Guinea worm disease used to be common This parasite has troubled humans for a long time. There are records of guinea worm disease dating back thousands of years.{ref}Watts, S. (1998). An ancient scourge: the end of Dracunculiasis in Egypt. _Social Science & Medicine_, _46_(7), 811–819. [https://doi.org/10.1016/S0277-9536(97)00213-X](https://doi.org/10.1016/S0277-9536(97)00213-X) {/ref} It was endemic in Asia, the Middle East, and much of Africa in the early twentieth century.{ref}Tayeh, A., Cairncross, S., & Cox, F. E. (2017). Guinea worm: from Robert Leiper to eradication. _Parasitology_, _144_(12), 1643-1648.{/ref} It was common in poor, remote villages without [access to clean drinking water](https://ourworldindata.org/water-access). This was because sources of stagnant water – such as large open wells and ponds – could be contaminated by water fleas that contained guinea worm larvae. Unfortunately, people do not develop immunity to the disease if they have been infected, which means it was common for people to be reinfected several times. For example, in the 1960s, in some villages in South India, more than 70% of adults infected once had been reinfected later on, and 10% had been infected at least 10 times.{ref}Reddy, C. R. R. M., Narasaiah, I. L., & Parvathi, G. (1969). Epidemiological studies on guinea-worm infection. Bulletin of the World Health Organization, 40(4), 521. [https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2556107/pdf/bullwho00225-0041.pdf](https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2556107/pdf/bullwho00225-0041.pdf) {/ref} By the 1980s, guinea worm disease was known to be endemic in 20 countries in South Asia and parts of Africa. We see this in the map, which shows the number of reported cases by country in 1989. In 1986, around 35,000 cases were reported to the World Health Organization (WHO). As surveillance improved, detected cases increased to 890,000 in 1989. <Chart url="https://ourworldindata.org/grapher/number-of-reported-guinea-worm-dracunculiasis-cases?tab=map&time=1989"/> ## How can guinea worm disease be prevented? Unfortunately, there are no vaccines against guinea worm disease. However, the disease has several features that make it easy to prevent. First, humans are the main 'host' of the disease, with only a few exceptions.{ref}Molyneux, D., & Sankara, D. P. (2017). Guinea worm eradication: Progress and challenges—should we beware of the dog?. _PLoS Neglected Tropical Diseases_, _11_(4), e0005495.{/ref} The worm larvae are unable to survive for more than a few weeks in water fleas.{ref}Hopkins, D. R., & Ruiz-Tiben, E. (2011). Dracunculiasis (guinea worm disease): case study of the effort to eradicate guinea worm. [https://www.cartercenter.org/resources/pdfs/news/health_publications/selendy-waterandsanitationrelateddiseases-chapt10.pdf](https://www.cartercenter.org/resources/pdfs/news/health_publications/selendy-waterandsanitationrelateddiseases-chapt10.pdf) Cleveland, C. A., Garrett, K. B., Box, E. K., Eure, Z., Majewska, A. A., Wilson, J. A., & Yabsley, M. J. (2020). Cooking copepods: The survival of cyclopoid copepods (Crustacea: Copepoda) in simulated provisioned water containers and implications for the Guinea Worm Eradication Program in Chad, Africa. _International Journal of Infectious Diseases_, _95_, 216-220.{/ref} This means the worms can easily die out if prevented from infecting humans. That brings us to our second point: we know how to stop it from infecting people. When people avoid drinking contaminated water that contains water fleas and guinea worm larvae, they are prevented from being infected. Third, the disease is seasonal. People infected in one season tend to release worms a year later, which restarts the seasonal cycle. In the past, when villages halted the spread of worms in a single season, the disease stopped entirely unless it was reintroduced from somewhere else.{ref}In dry climates, the disease is more common in rainy seasons when water accumulates in ponds and wells. In wet climates, the disease is more common in dry seasons when water is drying up and becoming stagnant. Muller, R. (1979). Guinea worm disease: epidemiology, control, and treatment. _Bulletin of the World Health Organization_, _57_(5), 683.{/ref} ## The world has made huge progress against the disease The world has made tremendous progress in reducing the burden of this disease with the knowledge of how to prevent it from spreading. The campaign to eradicate guinea worm disease began in the 1980s. It was led by a number of organizations including the Centers for Disease Control and Prevention in the United States (US CDC), the Carter Center, the WHO, and the United Nations Children's Fund (UNICEF).{ref}Hopkins, D. R., Ruiz-Tiben, E., Eberhard, M. L., Weiss, A., Withers, P. C., Roy, S. L., & Sienko, D. G. (2018). Dracunculiasis Eradication: Are We There Yet?. _The American journal of tropical medicine and hygiene_, _99_(2), 388–395. [https://doi.org/10.4269/ajtmh.18-0204](https://doi.org/10.4269/ajtmh.18-0204) {/ref} Village volunteers have played a major role in the eradication program. They provide people with water filters and larvicides, educate them about where to drink clean water, record cases, help treat patients who are suffering from the disease, and prevent them from releasing worms into the water.{ref}Hopkins, D. R., & Ruiz-Tiben, E. (2011). Dracunculiasis (guinea worm disease): case study of the effort to eradicate guinea worm. https://www.cartercenter.org/resources/pdfs/news/health_publications/selendy-waterandsanitationrelateddiseases-chapt10.pdf {/ref} Another key driver of progress is access to improved drinking water sources, which has become more common in many countries. You can see the change since the start of the eradication campaign in the chart. Cases of guinea worm disease declined rapidly across many countries. Over 890,000 cases were recorded worldwide in 1989. By 2021, there were just 15. Almost all of the 15 cases were recorded in Chad. <Chart url="https://ourworldindata.org/grapher/number-of-reported-guinea-worm-dracunculiasis-cases?tab=chart&country=OWID_WRL~UGA~TCD~PAK~IND~MRT"/> ## Which countries have eliminated guinea worm disease? In many countries, guinea worm disease has been completely eliminated. Countries are certified as free of guinea worm disease if they have reported zero indigenous cases for at least three consecutive years while having active surveillance.{ref}They are certified by the International Commission for the Certification of Dracunculiasis Eradication (ICCDE), which was set up in 1995. _The International Commission for the Certification of Dracunculiasis Eradication – About us._ (n.d.). World Health Organization. Retrieved June 3, 2022, from https://www.who.int/groups/international-commission-for-the-certification-of-dracunculiasis-eradication/about{/ref} On the map, you can see which countries are certified as being free of guinea worm disease. They are shown in blue. Using the timeline at the bottom of the chart you can see how each country’s status changed over time. In 1996, 16 countries were known to be endemic for guinea worm disease. By 2021, only five countries remained endemic – Mali, Chad, South Sudan, Ethiopia, and Angola. <Chart url="https://ourworldindata.org/grapher/progress-towards-guinea-worm-disease-eradication"/> ## We are close to eradicating guinea worm disease, but challenges remain To eradicate guinea worm disease globally, there are several challenges we need to overcome. A general challenge is that it takes around a year after infection for the worm to emerge from a person's body. This is why countries need to monitor for new cases for several years after they have reported zero cases, in order to achieve certification. Another problem is that a few countries, such as Chad and Ethiopia, have recently had outbreaks linked to dogs infected with the worms, which had not been seen before. That means extra efforts have been needed in recent years to prevent infections in dogs in those regions.{ref}Molyneux, D., & Sankara, D. P. (2017). Guinea worm eradication: Progress and challenges—should we beware of the dog?. _PLoS Neglected Tropical Diseases_, _11_(4), e0005495. Hopkins, D. R., Ruiz-Tiben, E., Eberhard, M. L., Weiss, A., Withers, P. C., Roy, S. L., & Sienko, D. G. (2018). Dracunculiasis Eradication: Are We There Yet? _The American Journal of Tropical Medicine and Hygiene_, _99_(2), 388–395. [https://doi.org/10.4269/ajtmh.18-0204](https://doi.org/10.4269/ajtmh.18-0204) {/ref} Finally, it has been difficult to eliminate guinea worm disease in countries with violence and conflict, where healthcare workers are less able to treat and prevent infections.{ref}Kelly-Hope, L. A., & Molyneux, D. H. (2021). Quantifying conflict zones as a challenge to certification of Guinea worm eradication in Africa: a new analytical approach. _BMJ open_, _11_(8), e049732. In some cases, the eradication effort has worked around conflicts or addressed them. For example, in 1995, former US president Jimmy Carter was involved in negotiating a ceasefire during the Second Sudanese Civil War, to allow healthcare workers to begin efforts to eradicate guinea worm disease in the region. Hopkins, D. R., & Ruiz-Tiben, E. (2011). Dracunculiasis (guinea worm disease): case study of the effort to eradicate guinea worm. [https://www.cartercenter.org/resources/pdfs/news/health_publications/selendy-waterandsanitationrelateddiseases-chapt10.pdf](https://www.cartercenter.org/resources/pdfs/news/health_publications/selendy-waterandsanitationrelateddiseases-chapt10.pdf) {/ref} Despite these challenges, there has been a massive decline in guinea worm cases over time. Only 13 cases were reported globally in 2022. The world is so close to the goal and with dedicated effort, we may soon achieve it. After thousands of years, the entire world may soon be free of this debilitating disease. _**Keep reading on Our World in Data:**_ ### Clean Water https://ourworldindata.org/water-access **Acknowledgments:** Hannah Ritchie and Max Roser provided very helpful guidance and comments that helped improve this post. | {
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"rendered": "\n<div class=\"wp-block-columns\">\n<div class=\"wp-block-column\">\n<p>Guinea worm disease is a painful and debilitating disease that used to be common in Asia, the Middle East, and many countries in Africa. </p>\n\n\n\n<p>It\u2019s now close to being eradicated worldwide. This success is thanks to an eradication program that has focused on water treatment and filtration, public education, and providing safe sources of drinking water to reduce its spread.</p>\n\n\n\n<h4>What is guinea worm disease?</h4>\n</div>\n\n\n\n<div class=\"wp-block-column\"></div>\n</div>\n\n\n\n<div class=\"wp-block-columns\">\n<div class=\"wp-block-column\">\n<p>The disease is caused by a parasite called guinea worm (<em>Dracunculus medinensis</em>). The worm’s larvae are carried by water fleas found in stagnant water in ponds, open wells, and freshwater lakes.</p>\n\n\n\n<p>When someone drinks contaminated water, the larvae can invade their stomach and intestines. </p>\n\n\n\n<p>Over time, they mature into adult worms \u2013 with female worms growing up to around a meter in length \u2013 and crawl through people’s connective tissue, joints, and bones. This growth leads to arthritic conditions, which can debilitate people for months. Around one in two hundred infected people develop a permanent disability from the disease.{ref}Imtiaz, R., Hopkins, D. R., & Ruiz-Tiben, E. (1990). Permanent disability from dracunculiasis. <em>The Lancet</em>, <em>336</em>(8715), 630. https://doi.org/10.1016/0140-6736(90)93427-Q{/ref}</p>\n\n\n\n<p>Around a year after the infection, the worm begins to emerge from the skin through a painful blister. This process also increases the risks of other infections.</p>\n\n\n\n<p>People often try to find relief from the infection by putting their blisters in open water. This might bring some temporary relief for them but makes it harder to eliminate the disease. In the water, the worm can release its own larvae, and if the water contains water fleas, this restarts the life cycle of the guinea worm.\u00a0</p>\n\n\n\n<p>The disease can be treated with pain medication and antibiotics and by carefully removing the worm when it emerges.{ref}Biswas, G., Sankara, D. P., Agua-Agum, J., & Maiga, A. (2013). Dracunculiasis (guinea worm disease): eradication without a drug or a vaccine. <em>Philosophical Transactions of the Royal Society B: Biological Sciences</em>, <em>368</em>(1623), 20120146. <a href=\"https://doi.org/10.1098/rstb.2012.0146\">https://doi.org/10.1098/rstb.2012.0146</a>Sankara, D.P., Korkor, A.S., Agua-Agum, J., Biswas, G. (2016). Dracunculiasis (Guinea Worm Disease). In: Gyapong, J., Boatin, B. (eds) Neglected Tropical Diseases – Sub-Saharan Africa. Neglected Tropical Diseases. Springer, Cham. <a href=\"https://doi.org/10.1007/978-3-319-25471-5_3\">https://doi.org/10.1007/978-3-319-25471-5_3</a> {/ref}</p>\n</div>\n\n\n\n<div class=\"wp-block-column\"></div>\n</div>\n\n\n\n<div class=\"wp-block-columns\">\n<div class=\"wp-block-column\">\n<h4>Guinea worm disease used to be common</h4>\n</div>\n\n\n\n<div class=\"wp-block-column\"></div>\n</div>\n\n\n\n<div class=\"wp-block-columns\">\n<div class=\"wp-block-column\">\n<p>This parasite has troubled humans for a long time. There are records of guinea worm disease dating back thousands of years.{ref}Watts, S. (1998). An ancient scourge: the end of Dracunculiasis in Egypt. <em>Social Science & Medicine</em>, <em>46</em>(7), 811\u2013819. <a href=\"https://doi.org/10.1016/S0277-9536(97)00213-X\">https://doi.org/10.1016/S0277-9536(97)00213-X</a> {/ref}</p>\n\n\n\n<p>It was endemic in Asia, the Middle East, and much of Africa in the early twentieth century.{ref}Tayeh, A., Cairncross, S., & Cox, F. E. (2017). Guinea worm: from Robert Leiper to eradication. <em>Parasitology</em>, <em>144</em>(12), 1643-1648.{/ref}</p>\n\n\n\n<p>It was common in poor, remote villages without <a href=\"https://ourworldindata.org/water-access\">access to clean drinking water</a>. This was because sources of stagnant water \u2013 such as large open wells and ponds \u2013 could be contaminated by water fleas that contained guinea worm larvae.</p>\n\n\n\n<p>Unfortunately, people do not develop immunity to the disease if they have been infected, which means it was common for people to be reinfected several times. For example, in the 1960s, in some villages in South India, more than 70% of adults infected once had been reinfected later on, and 10% had been infected at least 10 times.{ref}Reddy, C. R. R. M., Narasaiah, I. L., & Parvathi, G. (1969). Epidemiological studies on guinea-worm infection. Bulletin of the World Health Organization, 40(4), 521. <a href=\"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2556107/pdf/bullwho00225-0041.pdf\">https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2556107/pdf/bullwho00225-0041.pdf</a> {/ref}</p>\n\n\n\n<p>By the 1980s, guinea worm disease was known to be endemic in 20 countries in South Asia and parts of Africa. We see this in the map, which shows the number of reported cases by country in 1989.</p>\n\n\n\n<p>In 1986, around 35,000 cases were reported to the World Health Organization (WHO). As surveillance improved, detected cases increased to 890,000 in 1989.</p>\n</div>\n\n\n\n<div class=\"wp-block-column\">\n<iframe src=\"https://ourworldindata.org/grapher/number-of-reported-guinea-worm-dracunculiasis-cases?tab=map&time=1989\" loading=\"lazy\" style=\"width: 100%; height: 600px; border: 0px none;\"></iframe>\n</div>\n</div>\n\n\n\n<div class=\"wp-block-columns\">\n<div class=\"wp-block-column\">\n<h4>How can guinea worm disease be prevented?</h4>\n</div>\n\n\n\n<div class=\"wp-block-column\"></div>\n</div>\n\n\n\n<div class=\"wp-block-columns\">\n<div class=\"wp-block-column\">\n<p>Unfortunately, there are no vaccines against guinea worm disease. </p>\n\n\n\n<p>However, the disease has several features that make it easy to prevent. </p>\n\n\n\n<p>First, humans are the main ‘host’ of the disease, with only a few exceptions.{ref}Molyneux, D., & Sankara, D. P. (2017). Guinea worm eradication: Progress and challenges\u2014should we beware of the dog?. <em>PLoS Neglected Tropical Diseases</em>, <em>11</em>(4), e0005495.{/ref} The worm larvae are unable to survive for more than a few weeks in water fleas.{ref}Hopkins, D. R., & Ruiz-Tiben, E. (2011). Dracunculiasis (guinea worm disease): case study of the effort to eradicate guinea worm. <a href=\"https://www.cartercenter.org/resources/pdfs/news/health_publications/selendy-waterandsanitationrelateddiseases-chapt10.pdf\">https://www.cartercenter.org/resources/pdfs/news/health_publications/selendy-waterandsanitationrelateddiseases-chapt10.pdf</a><br>Cleveland, C. A., Garrett, K. B., Box, E. K., Eure, Z., Majewska, A. A., Wilson, J. A., & Yabsley, M. J. (2020). Cooking copepods: The survival of cyclopoid copepods (Crustacea: Copepoda) in simulated provisioned water containers and implications for the Guinea Worm Eradication Program in Chad, Africa. <em>International Journal of Infectious Diseases</em>, <em>95</em>, 216-220.{/ref} This means the worms can easily die out if prevented from infecting humans.</p>\n\n\n\n<p>That brings us to our second point: we know how to stop it from infecting people. When people avoid drinking contaminated water that contains water fleas and guinea worm larvae, they are prevented from being infected.</p>\n\n\n\n<p>Third, the disease is seasonal. People infected in one season tend to release worms a year later, which restarts the seasonal cycle. In the past, when villages halted the spread of worms in a single season, the disease stopped entirely unless it was reintroduced from somewhere else.{ref}In dry climates, the disease is more common in rainy seasons when water accumulates in ponds and wells. In wet climates, the disease is more common in dry seasons when water is drying up and becoming stagnant.<br>Muller, R. (1979). Guinea worm disease: epidemiology, control, and treatment. <em>Bulletin of the World Health Organization</em>, <em>57</em>(5), 683.{/ref}</p>\n</div>\n\n\n\n<div class=\"wp-block-column\"></div>\n</div>\n\n\n\n<div class=\"wp-block-columns\">\n<div class=\"wp-block-column\">\n<h4>The world has made huge progress against the disease</h4>\n</div>\n\n\n\n<div class=\"wp-block-column\"></div>\n</div>\n\n\n\n<div class=\"wp-block-columns\">\n<div class=\"wp-block-column\">\n<p>The world has made tremendous progress in reducing the burden of this disease with the knowledge of how to prevent it from spreading.</p>\n\n\n\n<p>The campaign to eradicate guinea worm disease began in the 1980s. It was led by a number of organizations including the Centers for Disease Control and Prevention in the United States (US CDC), the Carter Center, the WHO, and the United Nations Children’s Fund (UNICEF).{ref}Hopkins, D. R., Ruiz-Tiben, E., Eberhard, M. L., Weiss, A., Withers, P. C., Roy, S. L., & Sienko, D. G. (2018). Dracunculiasis Eradication: Are We There Yet?. <em>The American journal of tropical medicine and hygiene</em>, <em>99</em>(2), 388\u2013395. <a href=\"https://doi.org/10.4269/ajtmh.18-0204\">https://doi.org/10.4269/ajtmh.18-0204</a> {/ref}</p>\n\n\n\n<p>Village volunteers have played a major role in the eradication program. They provide people with water filters and larvicides, educate them about where to drink clean water, record cases, help treat patients who are suffering from the disease, and prevent them from releasing worms into the water.{ref}Hopkins, D. R., & Ruiz-Tiben, E. (2011). Dracunculiasis (guinea worm disease): case study of the effort to eradicate guinea worm. https://www.cartercenter.org/resources/pdfs/news/health_publications/selendy-waterandsanitationrelateddiseases-chapt10.pdf {/ref}</p>\n\n\n\n<p>Another key driver of progress is access to improved drinking water sources, which has become more common in many countries.</p>\n\n\n\n<p>You can see the change since the start of the eradication campaign in the chart. Cases of guinea worm disease declined rapidly across many countries. </p>\n\n\n\n<p>Over 890,000 cases were recorded worldwide in 1989. By 2021, there were just 15. </p>\n\n\n\n<p>Almost all of the 15 cases were recorded in Chad.</p>\n</div>\n\n\n\n<div class=\"wp-block-column\">\n<iframe src=\"https://ourworldindata.org/grapher/number-of-reported-guinea-worm-dracunculiasis-cases?tab=chart&country=OWID_WRL~UGA~TCD~PAK~IND~MRT\" loading=\"lazy\" style=\"width: 100%; height: 600px; border: 0px none;\"></iframe>\n</div>\n</div>\n\n\n\n<div class=\"wp-block-columns\">\n<div class=\"wp-block-column\">\n<h4>Which countries have eliminated guinea worm disease?</h4>\n</div>\n\n\n\n<div class=\"wp-block-column\"></div>\n</div>\n\n\n\n<div class=\"wp-block-columns\">\n<div class=\"wp-block-column\">\n<p>In many countries, guinea worm disease has been completely eliminated.</p>\n\n\n\n<p>Countries are certified as free of guinea worm disease if they have reported zero indigenous cases for at least three consecutive years while having active surveillance.{ref}They are certified by the International Commission for the Certification of Dracunculiasis Eradication (ICCDE), which was set up in 1995.<br><em>The International Commission for the Certification of Dracunculiasis Eradication \u2013 About us.</em> (n.d.). World Health Organization. Retrieved June 3, 2022, from https://www.who.int/groups/international-commission-for-the-certification-of-dracunculiasis-eradication/about{/ref}</p>\n\n\n\n<p>On the map, you can see which countries are certified as being free of guinea worm disease. They are shown in blue. Using the timeline at the bottom of the chart you can see how each country\u2019s status changed over time.</p>\n\n\n\n<p>In 1996, 16 countries were known to be endemic for guinea worm disease. By 2021, only five countries remained endemic \u2013 Mali, Chad, South Sudan, Ethiopia, and Angola.</p>\n</div>\n\n\n\n<div class=\"wp-block-column\">\n<iframe src=\"https://ourworldindata.org/grapher/progress-towards-guinea-worm-disease-eradication\" loading=\"lazy\" style=\"width: 100%; height: 600px; border: 0px none;\"></iframe>\n</div>\n</div>\n\n\n\n<div class=\"wp-block-columns\">\n<div class=\"wp-block-column\"></div>\n\n\n\n<div class=\"wp-block-column\"> <block type=\"prominent-link\" style=\"is-style-thin\">\n <link-url>https://ourworldindata.org/grapher/year-country-was-certified-free-of-guinea-worm-disease</link-url>\n <title></title>\n <content></content>\n <figure></figure>\n </block></div>\n</div>\n\n\n\n<div class=\"wp-block-columns\">\n<div class=\"wp-block-column\">\n<h4>We are close to eradicating guinea worm disease, but challenges remain</h4>\n</div>\n\n\n\n<div class=\"wp-block-column\"></div>\n</div>\n\n\n\n<div class=\"wp-block-columns\">\n<div class=\"wp-block-column\">\n<p>To eradicate guinea worm disease globally, there are several challenges we need to overcome.</p>\n\n\n\n<p>A general challenge is that it takes around a year after infection for the worm to emerge from a person’s body. This is why countries need to monitor for new cases for several years after they have reported zero cases, in order to achieve certification.</p>\n\n\n\n<p>Another problem is that a few countries, such as Chad and Ethiopia, have recently had outbreaks linked to dogs infected with the worms, which had not been seen before. That means extra efforts have been needed in recent years to prevent infections in dogs in those regions.{ref}Molyneux, D., & Sankara, D. P. (2017). Guinea worm eradication: Progress and challenges\u2014should we beware of the dog?. <em>PLoS Neglected Tropical Diseases</em>, <em>11</em>(4), e0005495.<br>Hopkins, D. R., Ruiz-Tiben, E., Eberhard, M. L., Weiss, A., Withers, P. C., Roy, S. L., & Sienko, D. G. (2018). Dracunculiasis Eradication: Are We There Yet? <em>The American Journal of Tropical Medicine and Hygiene</em>, <em>99</em>(2), 388\u2013395. <a href=\"https://doi.org/10.4269/ajtmh.18-0204\">https://doi.org/10.4269/ajtmh.18-0204</a> {/ref}</p>\n\n\n\n<p>Finally, it has been difficult to eliminate guinea worm disease in countries with violence and conflict, where healthcare workers are less able to treat and prevent infections.{ref}Kelly-Hope, L. A., & Molyneux, D. H. (2021). Quantifying conflict zones as a challenge to certification of Guinea worm eradication in Africa: a new analytical approach. <em>BMJ open</em>, <em>11</em>(8), e049732.<br>In some cases, the eradication effort has worked around conflicts or addressed them. For example, in 1995, former US president Jimmy Carter was involved in negotiating a ceasefire during the Second Sudanese Civil War, to allow healthcare workers to begin efforts to eradicate guinea worm disease in the region.<br>Hopkins, D. R., & Ruiz-Tiben, E. (2011). Dracunculiasis (guinea worm disease): case study of the effort to eradicate guinea worm. <a href=\"https://www.cartercenter.org/resources/pdfs/news/health_publications/selendy-waterandsanitationrelateddiseases-chapt10.pdf\">https://www.cartercenter.org/resources/pdfs/news/health_publications/selendy-waterandsanitationrelateddiseases-chapt10.pdf</a> {/ref}</p>\n\n\n\n<p>Despite these challenges, there has been a massive decline in guinea worm cases over time. Only 13 cases were reported globally in 2022. The world is so close to the goal and with dedicated effort, we may soon achieve it. After thousands of years, the entire world may soon be free of this debilitating disease.</p>\n</div>\n\n\n\n<div class=\"wp-block-column\"></div>\n</div>\n\n\n\n<hr class=\"wp-block-separator\"/>\n\n\n\n<p><em><strong>Keep reading on Our World in Data:</strong></em></p>\n\n\n <block type=\"prominent-link\" style=\"is-style-thin\">\n <link-url>https://ourworldindata.org/water-access</link-url>\n <title>Clean Water</title>\n <content>\n\n<p></p>\n\n</content>\n <figure></figure>\n </block>\n\n <block type=\"prominent-link\" style=\"is-style-thin\">\n <link-url>https://ourworldindata.org/polio</link-url>\n <title></title>\n <content>\n\n<p></p>\n\n</content>\n <figure></figure>\n </block>\n\n\n<p><strong>Acknowledgments:</strong> Hannah Ritchie and Max Roser provided very helpful guidance and comments that helped improve this post.</p>\n",
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"rendered": "In the late 1980s, there were near a million new cases of guinea worm disease recorded worldwide. In 2021, there were only 15. How was this achieved?",
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"date_gmt": "2022-07-07T09:00:00",
"modified": "2023-11-27T10:20:46",
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"authors_name": [
"Saloni Dattani",
"Fiona Spooner"
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