18 Diseases The World Has Turned Its Back On

18 Diseases The World Has Turned Its Back On

18 Diseases The World Has Turned Its Back On

This article is part HuffPost’s Project Zero campaign, a yearlong series on neglected tropical diseases and make further efforts to eliminate them.

More than 1 billion people on the planet suffer from illnesses that the world pays little attention to.

Neglected tropical illness are a group of at least 18 diseases that mainly affect people living in poverty in tropical regions of the world and are virtually unknown elsewhere, according to the World Health Organization.

These are diseases like river blindness, which has infected 18 million people worldwide and caused blindness in 270,000 people; or elephantiasis, a leading cause of disability worldwide, which affects over 120 million people and can cause severe swell of the body parts, usually the legs or the scrotum.

While only some of these maladies can be fatal, many of them can cause lifelong disabilities or disfigurement. And even though many neglected tropical illness are preventable and treatable, get proper medical care to the people who are most vulnerable can be challenging, as the diseases primarily affect people in high-poverty communities with limited access to health services.

“Because they are a threat only in impoverished settings, they have low visibility in the rest of the world, ” WHO Director-General Margaret Chan says in a 2010 report. “While the scale of the need for treatment is huge, the poverty of those affected limits their access to interventions and the services needed to deliver them.”

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18 Diseases The World Has Turned Its Back On
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It’s tough to identify a single cause for the neglect. While some criticize the pharmaceutical industry for not investing enough in treatments for neglected tropical illness likely because the poor populations affected wouldn’t make for a profitable customer base others tell it’s not Big Pharma’s job to build “non-profit medications, ” reports The Guardian. There have also been notable endeavors by countries and narcotic companies to work together to tackle these diseases.

Governments should prioritize research and funding to fight these diseases, the WHO’s Ashok Moo told The Huffington Post. And they should seek to improve conditions in poor communities that are hardest-hit, for instance, by investing in clean water and sanitation, which would help kerb the spread of some diseases.

There is one thing everyone can agree on: Far more needs to be done.

Here is a list of the neglected tropical diseases that are all too often ignored.

1. Elephantiasis

18 Diseases The World Has Turned Its Back On
DNDi/ Maneesh Agnihotri A man in India displaying symptoms oflymphatic filariasis, commonly known as elephantiasis, a neglected tropical cancer that causes scalp and tissue swelling.

Lymphatic filariasis, more commonly known as elephantiasis, is a leading cause of disability worldwide, in agreement with the U.S. Centres for Disease Control and Prevention.

It affects over 120 million people around the world, and can cause severe swell of the body parts, including the leg and scrotum.

While people are usually infected in childhood, the painful, disfiguring symptoms of the disease merely show up later on in life.

2. River Blindness

18 Diseases The World Has Turned Its Back On
ISSOUF SANOGO/ AFP/ Getty Images A blind man suffered by river blindness, caused by a parasitic worm, spread by the bite of an infected blackfly, in the Ivorian township of Kouadioa-Allaikro, 2008. Most infected people are in Africa, and the disease is find most frequently in rural agricultural villages that are located near rapidly flowing creeks.

Onchocerciasis, commonly known as river blindness, is an eye and skin disease that can cause severe itching and visual impairment including blindness.

Around 18 million people are infected. Of those, over 6.5 million suffer from severe itching, and 270,000 are blind.

The disease is caused by a parasitic worm, transmitted through bites from infected blackflies. The worm can live for up to 14 years in the human body and each adult female worm can be more than 1.5 feet long.

3. Chagas

18 Diseases The World Has Turned Its Back On
Nature Picture Library/ Getty Images Vinchuca( Triatoma infestans) strolling across human skin. The bug is a blood feeder, and vector of Chagas disease.

Chagas disease is a potentially life-threatening illness. In the first months after infection, symptoms are mild, including skin lesions and fever. But in its second, chronic stage, up to one in three patients develop cardiac disorders, which can lead to heart failure and sudden death.

The disease is transmitted to humen by “kissing bugs, ” which live in the walls or roof crackings of poorly constructed homes in rural areas, according to the WHO.

Of the estimated 6 million to 7 million people affected worldwide, most live in Latin America, but the disease has also spread to the United States: Around 300,000 people in the U.S. have Chagas disease, according to the Dallas Morning News.

4. Dengue

18 Diseases The World Has Turned Its Back On
Fachrul Reza/ NurPhoto/ Getty Images A health worker clouding densely populated areas in Indonesia, on Nov. 7. The fumigation is done to prevent the spread of the Aedes aegypti mosquito, which causes dengue during the rainy season.

Dengue is a flu-like illness that can sometimes be lethal.

In 2015, more than two million cases of dengue were reported in the Americas and in some Asian and Latin American countries, “severe” dengue is a leading cause of serious illness and demise among children.

Dengue is spread by the Aedes aegypti mosquitoes the same type of insect that transmits Zika. To reduce the risk of bites, the WHO recommends covering water containers, use insecticide, having window screens and wearing long sleeves.

5. Sleeping Sickness

18 Diseases The World Has Turned Its Back On
MARIZILDA CRUPPE/ DNDi Doctors Without Bordersstaff perform a spinal tap to try to diagnose sleeping sickness, in the village of Basoloy, region of Doromo , northeastern Democratic Republic of Congo.

Human African trypanosomiasis, commonly known as sleeping sickness, is a chronic infection that affects the central nervous system.

People can be infected for years without signs, but in the second stage, patients can suffer behavior changes, hallucinations and even slip into a coma and succumb.

Many people affected live in remote, rural areas that don’t have easy access to quality health services. This stimulates diagnosis and treatment more difficult.

The WHO has identified sleeping sickness as a disease that could be eliminated worldwide by 2020 if the right resources are dedicated to it.

6. Leishmaniasis

18 Diseases The World Has Turned Its Back On
Corbis Documentary/ Getty Images Leishmaniasis, caused by an intracellular protozoal parasite. The cancer is transmitted by the bite of a sand fly.

There are several different forms of leishmaniasis, including visceral, which can be fatal, with symptoms including fever and weight loss; and cutaneous, the more common kind, which causes skin lesions, leaving lifelong scars and disability.

The disease, spread by sandflies, affects some of the poorest people on earth, in agreement with the WHO, and was made in association with malnutrition and poor housing.

Around 1 million new cases pass annually, causing 20,000 to 30,000 deaths.

Leishmaniasis is climate-sensitive, affected by changes in rainfall, temperature and humidity which entails it could be exacerbated by global warming.

7. Trachoma

18 Diseases The World Has Turned Its Back On
STR via Getty Images An elderly female receives an eye inspection for trachoma in Hiep Hoa village, inThai Binh, Vietnam, July 6, 2005.

Trachoma is an eye disease, which if untreated, can cause irreversible blindness.

It causes visual impairment or blindness in 1.9 million people, per the WHO.

The disease is present in poor, rural areas of 42 countries in Africa, Latin America, Asia and the Middle East but Africa is the most affected.

8. Rabies

18 Diseases The World Has Turned Its Back On
NOAH SEELAM/ AFP/ Getty Images An Indian veterinary clinic employee gives a rabies vaccination to a pet puppy.

Rabies is almost always fatal once symptoms show up, in agreement with the WHO.

Initial symptoms are fever and tingling around the meander. As the virus spreads, people with “furious” rabies become hyperactive and die by cardiac arrest; people with “paralytic” rabies become paralyzed, fall into a coma and die.

Mostly transmitted to humen by pet puppies, rabies causes tens of thousands of deaths every year.

The disease is present on all continents except Antarctica but more than 95 percent of human deaths due to it occur in Asia and Africa. It is a neglected disease principally affecting poor populations, where vaccines are not readily available.

9. Leprosy

18 Diseases The World Has Turned Its Back On
Chandan Khanna/ AFP/ Getty Images A cured leprosy patient shows his disfigured feet and hands in a leprosy colony in New Delhi, on March 11, 2015. The last decade has watched a resurgence of leprosy in India, which accounts for more than half of the 200,000 new cases worldwide each year.

Leprosy is a chronic illness, which when untreated, can cause permanent damage to the skin, nerves, limbs and eyes.

There were 176,176 suits at the end of 2015, in agreement with the WHO.

While the stigma associated with the disease entails people are less likely to seek therapy, leprosy is curable, and therapy early on can avoid disability.

Leprosy was eliminated as a public health problem in 2000 meaning there is now less than one case for every 10,000 people worldwide.

10. Schistosomiasis

18 Diseases The World Has Turned Its Back On
Malaria Consortium An image from pamphlets Malaria Consortium volunteers use in Nampula, Mozambique, to educate people on neglected tropical cancers. Pictured here are symptoms of schistosomiasis.

Schistosomiasis is a chronic disease that causes gradual damage to internal organ. Symptoms include blood in urine, and in severe cases, kidney or liver failure, and even bladder cancer. Around 20,000 people die from it each year.

Transmitted by parasites in infested water, the disease largely affects poor, rural communities in Africa that lack access to safe drinking water and sanitation.

“[ People] get it as children bathing in water, ” Sandrine Martin, a staff member for the nonprofit Malaria Consortium in Mozambique, told HuffPost. “But the symptoms, like blood in the urine, only develop afterwards and then people tend to hide it because it’s in the genital area.”

11. Chikungunya

18 Diseases The World Has Turned Its Back On
Universal Images Group/ Getty Images TheAedes aegypti mosquito — pictured filled with blood — is the mosquito that transmits chikungunya, yellow fever and the Zika virus.

Chikungunya is a disease that causes fever and severe joint ache, according to the WHO. While it is rarely fatal, it is feasible to debilitating.

Since 2004, it has infected more than 2 million people in Asia and Africa.

There is no cure for the disease, which is transmitted to humen by infected mosquitoes.

The name comes from a word in the Kimakonde language, spoken in some areas of Mozambique and Tanzania, that entails “to become contorted” a nod to the hunched-over stance of people who are affected with joint pain.

12. Echinoccosis

18 Diseases The World Has Turned Its Back On
Smith Collection/ Gado/ Getty Images Man’s arm indicating positive skin test for echinococcosis.

Echinoccosis is a parasitic cancer that leads to cysts in the liver and lungs.

While it can be life-threatening if untreated, even people who receive treatment often have a reduced quality of life, according to the WHO.

Found in every continent except Antarctica, the disease is acquired by ingesting food or water contaminated with tapeworm eggs, or through direct linked with animals who carry it, such as domestic dogs or sheep.

13. Foodborne Trematodiases

18 Diseases The World Has Turned Its Back On
Alexandre Tremblot de La Croix via Getty Images Photo of sushi, a dish that includesraw fish.Foodborne trematodiases arecaused by worms, which people get by eating raw fish, shellfish or veggies with larvae.

Foodborne trematodiases can cause severe liver and lung disease, and on rare occasions death.

Most prevalent in East Asia and South America, the disease is caused by worms that people get by eating raw fish, shellfish or veggies that have been infected with larvae.

While early, light infections can be asymptomatic, chronic infections are severe.

More than 56 million people were infected with foodborne trematodes, and over 7,000 people been killed in 2005, the year of the WHO’s most recent global estimate.

14. Buruli Ulcer

18 Diseases The World Has Turned Its Back On
ISSOUF SANOGO/ AFP/ Getty Images A doctor dedicates comfort to a child suffered by Buruli ulcer at a clinic in Ivory Coast, on Sept. 12, 2009.

Buruli ulcer is a skin infection caused by bacteria that often starts as a painless swelling, but without treatment, it can lead to permanent disfigurement and disability.

In 2014, 2,200 new cases were reported, with most patients under age 15.

The exact mode of transmission is unknown but the majority of cases, if seen early enough, can be cured with antibiotics.

15. Yaws

18 Diseases The World Has Turned Its Back On
BIOPHOTO ASSOCIATES via Getty Images Yaws is an infection of the scalp, bones and joints caused by bacteria. The photo here shows yaws affecting a patient’s tibia.

Yaws is a chronic, disfiguring childhood infectious disease. Affecting skin, bone and cartilage, the symptoms show up weeks to months after infection and include yellow lesions and bone swelling.

More than 250,000 cases of yaws were reported from 2010 to 2013, WHO told HuffPost. A lack of clean water and soap for bathing contributes to its spread.

Only 13 countries are known to still have cases of yaws, including Ghana, Papua New Guinea and Solomon Islands.

16. Soil-Transmitted Helminth

18 Diseases The World Has Turned Its Back On
Malaria Consortium An image from pamphlets that Malaria Consortium volunteers use in Nampula, Mozambique, to educate people on neglected tropical diseases.Soil-transmitted helminth infections aretransmitted by human feces contaminating soil in areas with poor sanitation.

Soil-transmitted helminth infections are among the most common infections worldwide and affect the poorest communities. People are infected by worms transmitted by human feces contaminating clay in areas with poor sanitation.

People with light infections usually have no symptoms. Heavier infections can cause diarrhea, abdominal pain, general weakness and impaired cognitive developing. Depending on the number of worms, it can lead to demise.

Up to 2 billion people are infected worldwide, according to WHO. But because infections can be light , not all patients suffer, WHO’s Ashok Moo told HuffPost.

17. Taeniasis

18 Diseases The World Has Turned Its Back On
Science Source/ Getty Images Beef tapeworm( Taenia saginata ), a parasite of both cattles and humans, where it causes the disease taeniasis. This specimen was 10 meters long when untangled.

Taeniasis is an intestinal infection caused by tapeworms, which mostly causes mild symptoms, such as abdominal pain, nausea, diarrhea or constipation.

But if larvae infect the brain, causing neurocysticercosis, the disease can cause epileptic seizures and can be fatal.

People get it by eating raw or undercooked infected pork. The ingested tapeworm eggs develop into larvae and migrate through the body.

Taeniasis is underreported worldwide because it is hard to diagnose in areas with little access to health services, according to the CDC.

18. Guinea-Worm

18 Diseases The World Has Turned Its Back On
PETER MARTELL/ AFP/ Getty Images Former U.S. chairwoman Jimmy Carter visits the Sudanese village of Lojura — one of the world’s worst regions for Guinea worm — onFeb. 11, 2010. The Carter Centre has been working in Sudan since 1989 to eradicate it.

Guinea-worm is a crippling cancer that it is close to being eradicated.

There is no more than 22 human cases reported in 2015, in agreement with the WHO down from around 3.5 million instances in 21 countries in the mid-1 980 s.

The disease is usually transmitted when people with limited access to quality drinking water swallow stagnant water polluted with parasites.

About a year after infection, a painful blister sorts most of the time on the lower leg and one or more worms emerge, along with a burning sensation. It is rarely fatal, but can debilitate infected people for weeks.

This series is supported, in part, by funding from the Bill& Melinda Gates Foundation. All content is editorially independent, with no influence or input from the foundation. If you’d like to contribute a post to the series, send an email to ProjectZero @huffingtonpost. com. And follow the conversation on social media by using the hashtag #ProjectZero.

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18 Diseases The World Has Turned Its Back On
18 Diseases The World Has Turned Its Back On
18 Diseases The World Has Turned Its Back On
18 Diseases The World Has Turned Its Back On
18 Diseases The World Has Turned Its Back On

18 Diseases The World Has Turned Its Back On

18 Diseases The World Has Turned Its Back On

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