Waterborne disease

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Waterborne diseases
Groundwater Contamination Latin America Sm.png
Waterborne diseases can be spread via groundwater which is contaminated with fecal pathogens from pit latrines.
Specialty Infectious disease

Waterborne diseases are diseases caused by pathogenic micro-organisms that are transmitted by water. [1] These diseases can be spread while bathing, washing, drinking water, or by eating food exposed to contaminated water. [2] They are a pressing issue in rural areas amongst developing countries all over the world. While diarrhea and vomiting are the most commonly reported symptoms of waterborne illness, other symptoms can include nausea, stomach cramps, fever, and skin, ear, respiratory, or eye problems. [3] Lack of clean water supply, sanitation and hygiene (WASH) are major causes for the spread of waterborne diseases in a community. Therefore, reliable access to clean drinking water and sanitation is the main method to prevent waterborne diseases. [4]

Contents

Microorganisms causing diseases that characteristically are waterborne prominently include protozoa and bacteria, many of which are intestinal parasites, or invade the tissues or circulatory system through walls of the digestive tract. Various other waterborne diseases are caused by viruses.

Yet other important classes of waterborne diseases are caused by metazoan parasites. Typical examples include certain Nematoda, that is to say "roundworms". As an example of waterborne Nematode infections, one important waterborne nematode disease is Dracunculiasis. It is acquired by swallowing water in which certain copepoda occur that act as vectors for the Nematoda. Anyone swallowing a copepod that happens to be infected with Nematode larvae in the genus Dracunculus, becomes liable to infection. The larvae cause guinea worm disease. [5]

Another class of waterborne metazoan pathogens are certain members of the Schistosomatidae, a family of blood flukes. They usually infect people that make skin contact with the water. [5] Blood flukes are pathogens that cause Schistosomiasis of various forms, more or less seriously affecting hundreds of millions of people worldwide. [6]

Terminology

Red blood cells of an organism which has contracted malaria, a water borne disease Red blood cells infected with malaria.jpg
Red blood cells of an organism which has contracted malaria, a water borne disease

The term waterborne disease is reserved largely for infections that predominantly are transmitted through contact with or consumption of microbially polluted water. Many infections may be transmitted by microbes or parasites that accidentally, possibly as a result of exceptional circumstances, have entered the water. However, the fact that there might be an occasional infection need not mean that it is useful to categorize the resulting disease as "waterborne". Nor is it common practice to refer to diseases such as malaria as "waterborne" just because mosquitoes have aquatic phases in their life cycles, or because treating the water they inhabit happens to be an effective strategy in control of the mosquitoes that are the vectors.[ citation needed ]

A related term is "water-related disease" which is defined as "any significant or widespread adverse effects on human health, such as death, disability, illness or disorders, caused directly or indirectly by the condition, or changes in the quantity or quality of any water". [7] :47 Water-related diseases are grouped according to their transmission mechanism: water borne, water hygiene, water based, water related. [7] :47 The main transmission mode for waterborne diseases is ingestion of contaminated water.[ citation needed ]

Causes

Lack of clean water supply, sanitation and hygiene (WASH) are major causes for the spread of waterborne diseases in a community. The fecal–oral route is a disease transmission pathway for waterborne diseases. [8] Poverty also increases the risk of communities to be affected by waterborne diseases. For example, the economic level of a community impacts their ability to have access to clean water. [9] Less developed countries might be more at risk for potential outbreaks of waterborne diseases but more developed regions also are at risk to waterborne disease outbreaks. [10]

Socioeconomic factors

The lack of education in impoverished regions is a key component to the issue of waterborne disease. The more a society is educated on an issue, the more they can take action and solve the problem domestically rather than relying on foreign counties for aid. Many countries in the Middle East, South East Asia, and Sub-Saharan Africa are prone to these issues because they lack advanced education. [11] For example, Morocco has a very insufficient labor supply for the production of food and other work forces that it could very well be maximizing. In response, the United States and Morocco along with many other agencies worked together to initiate H2O Maghreb. This program works to educated the people of Morocco on clean water and sanitization through simulations of water treatment. Not only do the virtual reality technologies recreate rare emergency circumstances to practice dealing with, but they also provide jobs for a poorer country to help the economy too. [11]

Political turmoil and war stimulate the transmission of waterborne disease in addition to lack of education. Countries in the Eastern Mediterranean Region deal with this issue especially. [12] The world bank has classified Yemen, along with several other countries in the Eastern Mediterranean Region as "fragile and conflict-affected countries." Syria and Lebanon [13] had not seen any out breaks of cholera in about three decades, yet they did in 2022. War destroys necessary infrastructure for clean water and sanitization structures: a recipe for disease to spread. Two years ago the world health organization changed the status of cholera to a Grade 3 global public health emergency. Between the years 2016 and 2022 Yemen saw 2.5 million cases of cholera. [14] These outbreaks are closely tied to the conflicts in the region. War also destroys the necessary medical facilities and hospitals to take care of patients who have contracted the waterborne diseases. In the Eastern Mediterranean Region, countries are no longer grappling with a pandemic, but rather an endemic. [12]

Other war torn regions such as Gaza must manage complex water systems which present more danger to the quality of water and chance of waterborne disease being present. Gaza gets the majority of their water from underground but also some from Israel; they also have several desalination plants across the region. [15] Workers are constantly working to fix water pipeline systems that have been destroyed by artillery from the war but are sometimes killed in the process. [15] For a comparison of a safe country's clean water consumption to a war torn country's water consumption, Americans use about 300 liters per day while in Gaza a person would use about 80 liters per day. With every part of the water system in Gaza suffering harm in some shape or form by 2024, waterborne disease cases shortly thereafter exploded with 600,000 cases of acute diarrhea and even a 10 month old with polio. [15]

Influence of climate change

Climate change influences the growth and survival of bacteria and other pathogens in food and water systems. [16] [17] [18] It affects waterborne diseases by influencing water temperature, water quality, sanitation, and microbial ecology. [19] :1107 [20] :12

Warmer waters, increased flooding, precipitation and humidity promote the growth and spread of bacteria such as Vibrio cholerae, which causes cholera, and other pathogens responsible for gastroenteritis, wound infections and diarrheal diseases. [19] :1107 [20] :12 [21] Higher water temperatures can also increase the yield of bacteria from drinking water delivery systems and during periods of warmer temperatures water consumption rates are also typically higher. Together these increase the probability of pathogen ingestion and infection. [22]

Heavy rainfall and flooding caused by climate change can also affect pathogen transmission via impacts on sanitation and/or drinking water treatment infrastructure, contaminating drinking water sources or food products. Floods can overwhelm water systems, causing backflows that lead to contamination of groundwater and other drinking water sources. [21]

Diseases by type of pathogen

Protozoa

Disease and transmission [3] [23] Microbial agentSources of agent in water supplyGeneral symptoms
Acanthamoeba keratitis (cleaning of contact lenses with contaminated water) Acanthamoeba spp. (A. castellanii and A. polyphaga)widely distributed free-living amoebae found in many types of aquatic environments, including surface water, tap water, swimming pools, and contact lens solutionsEye pain, eye redness, blurred vision, sensitivity to light, sensation of something in the eye, and excessive tearing
Amoebiasis (hand-to-mouth)Protozoan ( Entamoeba histolytica ) (Cyst-like appearance) Sewage, non-treated drinking water, flies in water supply, saliva transfer(if the other person has the disease)Abdominal discomfort, fatigue, weight loss, diarrhea, bloating, fever
Cryptosporidiosis (oral)Protozoan ( Cryptosporidium parvum )Collects on water filters and membranes that cannot be disinfected, animal manure, seasonal runoff of water. Flu-like symptoms, watery diarrhea, loss of appetite, substantial loss of weight, bloating, increased gas, nausea
Cyclosporiasis Protozoan parasite ( Cyclospora cayetanensis ) Sewage, non-treated drinking water cramps, nausea, vomiting, muscle aches, fever, and fatigue
Giardiasis (fecal-oral) (hand-to-mouth)Protozoan ( Giardia lamblia ) Most common intestinal parasiteUntreated water, poor disinfection, pipe breaks, leaks, groundwater contamination, campgrounds where humans and wildlife use same source of water. Beavers and muskrats create ponds that act as reservoirs for Giardia.Diarrhea, abdominal discomfort, bloating, and flatulence
Microsporidiosis Protozoan phylum ( Microsporidia ), but closely related to fungi Encephalitozoon intestinalis has been detected in groundwater, the origin of drinking water [24] Diarrhea and wasting in immunocompromised individuals.
Naegleriasis (primary amebic meningoencephalitis [PAM]) (nasal)Protozoan ( Naegleria fowleri ) (Cyst-like appearance) Watersports, non-chlorinated water Headache, vomiting, confusion, loss of balance, light sensitivity, hallucinations, fatigue, weight loss, fever, and coma

Bacteria

Disease and transmission [25] [26] Microbial agentSources of agent in water supplyGeneral symptoms
Botulism Clostridium botulinum Bacteria can enter an open wound from contaminated water sources. Can enter the gastrointestinal tract through consumption of contaminated drinking water or (more commonly) foodDry mouth, blurred and/or double vision, difficulty swallowing, muscle weakness, difficulty breathing, slurred speech, vomiting and sometimes diarrhea. Death is usually caused by respiratory failure.
Campylobacteriosis Most commonly caused by Campylobacter jejuni Drinking water contaminated with feces Produces dysentery-like symptoms along with a high fever. Usually lasts 2–10 days.
Cholera Spread by the bacterium Vibrio cholerae Drinking water contaminated with the bacteriumIn severe forms it is known to be one of the most rapidly fatal illnesses known. Symptoms include very watery diarrhea, nausea, cramps, nosebleed, rapid pulse, vomiting, and hypovolemic shock (in severe cases), at which point death can occur in 12–18 hours.
E. coli Infection Certain strains of Escherichia coli (commonly E. coli)Water contaminated with the bacteriaMostly diarrhea. Can cause death in immunocompromised individuals, the very young, and the elderly due to dehydration from prolonged illness.
M. marinum infection Mycobacterium marinum Naturally occurs in water, most cases from exposure in swimming pools or more frequently aquariums; rare infection since it mostly infects immunocompromised individualsSymptoms include lesions typically located on the elbows, knees, and feet (from swimming pools) or lesions on the hands (aquariums). Lesions may be painless or painful.
Dysentery Caused by a number of species in the genera Shigella and Salmonella with the most common being Shigella dysenteriae Water contaminated with the bacteriumFrequent passage of feces with blood and/or mucus and in some cases vomiting of blood.
Legionellosis (two distinct forms: Legionnaires' disease and Pontiac fever)Caused by bacteria belonging to genus Legionella (90% of cases caused by Legionella pneumophila )Legionella is a very common organism that reproduces to high numbers in warm water; [27] but only causes severe disease when aerosolized. [28] Pontiac fever produces milder symptoms resembling acute influenza without pneumonia. Legionnaires' disease has severe symptoms such as fever, chills, pneumonia (with cough that sometimes produces sputum), ataxia, anorexia, muscle aches, malaise and occasionally diarrhea and vomiting
Leptospirosis Caused by bacterium of genus Leptospira Water contaminated by the animal urine carrying the bacteriaBegins with flu-like symptoms then resolves. The second phase then occurs involving meningitis, liver damage (causes jaundice), and kidney failure
Otitis Externa (swimmer's ear)Caused by a number of bacterial and fungal species.Swimming in water contaminated by the responsible pathogens Ear canal swells, causing pain and tenderness to the touch
Salmonellosis Caused by many bacteria of genus Salmonella Drinking water contaminated with the bacteria. More common as a food borne illness.Symptoms include diarrhea, fever, vomiting, and abdominal cramps
Typhoid fever Salmonella typhi Ingestion of water contaminated with feces of an infected personCharacterized by sustained fever up to 40 °C (104 °F), profuse sweating; diarrhea, muscle aches, fatigue, and constipation may occur. Symptoms progress to delirium, and the spleen and liver enlarge if untreated. In this case, it can last up to four weeks and cause death. Some people with typhoid fever develop a rash called "rose spots", small red spots on the abdomen and chest.
Vibrio Illness Vibrio vulnificus , Vibrio alginolyticus , and Vibrio parahaemolyticus Can enter wounds from contaminated water. Also acquired by drinking contaminated water or eating undercooked oysters.Symptoms include abdominal tenderness, agitation, bloody stools, chills, confusion, difficulty paying attention (attention deficit), delirium, fluctuating mood, hallucination, nosebleeds, severe fatigue, slow, sluggish, lethargic feeling, weakness.

Viruses

Hepatitis A virusHepatitis A is one of waterborne diseases and its symptoms are only acute. Symptoms include fatigue, fever, etc. Hepatitis A virus 01.jpg
Hepatitis A virusHepatitis A is one of waterborne diseases and its symptoms are only acute. Symptoms include fatigue, fever, etc.
Disease and transmission [24] [29] [3] [30] [31] Viral agentSources of agent in water supplyGeneral symptoms
Hepatitis A Hepatitis A virus (HAV)Can manifest itself in water (and food)Symptoms are only acute (no chronic stage to the virus) and include Fatigue, fever, malaise, abdominal pain, nausea, diarrhea, weight loss, itching, jaundice, and depression.
Hepatitis E (fecal-oral) Hepatitis E virus (HEV)Enters water through the feces of infected individualsSymptoms of acute hepatitis (liver disease), including fever, fatigue, loss of appetite, nausea, vomiting, abdominal pain, jaundice, dark urine, clay-colored stool, and joint pain
Acute gastrointestinal illness [AGI] (fecal-oral; spread by food, water, person-to-person, and fomites) Norovirus Enters water through the feces of infected individuals Diarrhea, vomiting, nausea, stomach pain
Poliomyelitis (Polio) Poliovirus Enters water through the feces of infected individuals90–95% of patients show no symptoms, 4–8% have minor symptoms (comparatively) with delirium, headache, fever, and occasional seizures, and spastic paralysis, 1% have symptoms of non-paralytic aseptic meningitis. The rest have serious symptoms resulting in paralysis or death
Polyomavirus infection Two of Polyomavirus: JC virus and BK virus Very widespread, can manifest itself in water, ~80% of the population has antibodies to PolyomavirusBK virus produces a mild respiratory infection and can infect the kidneys of immunosuppressed transplant patients. JC virus infects the respiratory system, kidneys or can cause progressive multifocal leukoencephalopathy in the brain (which is fatal).

Algae

Disease and transmission [32] Microbial agentSources of agent in water supplyGeneral symptoms
Desmodesmus infection desmodesmus armatusNaturally occurs in water. Can enter open wounds.Similar to fungal infection.

Parasitic worms

Disease and transmission [5] [3] AgentSources of agent in water supplyGeneral symptoms
Dracunculiasis [Guinea worm disease] (ingestion of contaminated water) Dracunculus medinensis Female worm emerges from host skin and releases larvae in water.Slight fever, itchy rash, nausea, vomiting, diarrhea, dizziness, followed by formation of painful blister (typically on lower body parts)

Prevention

Reliable access to clean,uncontaminated drinking water and proper sanitation are the main methods to prevent waterborne diseases. Vaccination is another methord to prevent the body from geting water-born diseases [4] The aim is to break the fecal–oral route of disease transmission. [4]

Solar energy has been become a clean and efficient means by which water can now be distilled and desalinated. This method is environmentally safe because it does not produce mass amounts of carbon dioxide that could damage the planet. In fact, the carbon dioxide emissions are virtually zero from using solar energy to distill or desalinate water. [33]

Desalination is the process by which salt is removed from water making it potable. Because water is a scarce resource, meaning that there is a finite amount of it for all of humanity to share, research into sustainability methods for increasing the amount of potable water is important. [34] With an abundance of salt water on Earth, the solar desalination method is innovative and presents potential. It works by using solar panels that capture solar energy from the sun which it then uses to remove the salt from the water through a process called reverse osmosis. The solar energy is converted into electricity via the solar panels. This electricity is then used to push the water at high pressures through filters that block the salt from passing through but do allow the water to pass. [35] This method of desalination is also beneficial to society because it can be used in remote locations. It does not require a connection to a large pipeline system traditionally used that also produce large amounts of carbon dioxide. Specifically, this method is most productive were there is ready access to salt water, an abundance of sunshine, and a lack of fresh drinkable water. [35]

Other policies and precautions can be taken too in order to prevent the spread of disease through contaminated water. For example, appropriate amounts of chlorine can be added to the potable water pipes to remove viruses. Typical household precautions including the use of disinfection wipes and sanitization sprays also are important to use around areas where clean water consumption is very important such as in bathrooms and kitchens. [36]

Epidemiology

According to the World Health Organization, waterborne diseases account for an estimated 3.6% of the total DALY (disability- adjusted life year) global burden of disease, and cause about 1.5 million human deaths annually. The World Health Organization estimates that 58% of that burden, or 842,000 deaths per year, is attributable to a lack of safe drinking water supply, sanitation and hygiene (summarized as WASH). [4]

United States

The Waterborne Disease and Outbreak Surveillance System (WBDOSS) is the principal database used to identify the causative agents, deficiencies, water systems, and sources associated with waterborne disease and outbreaks in the United States. [37] Since 1971, the Centers for Disease Control and Prevention (CDC), the Council of State and Territorial Epidemiologists (CSTE), and the US Environmental Protection Agency (EPA) have maintained this surveillance system for collecting and reporting data on "waterborne disease and outbreaks associated with recreational water, drinking water, environmental, and undetermined exposures to water." [37] [38] "Data from WBDOSS have supported EPA efforts to develop drinking water regulations and have provided guidance for CDC's recreational water activities." [37] [38]

WBDOSS relies on complete and accurate data from public health departments in individual states, territories, and other U.S. jurisdictions regarding waterborne disease and outbreak activity. [37] In 2009, reporting to the WBDOSS transitioned from a paper form to the electronic National Outbreak Reporting System (NORS). [37] Annual or biennial surveillance reports of the data collected by the WBDOSS have been published in CDC reports from 1971 to 1984; since 1985, surveillance data have been published in the Morbidity and Mortality Weekly Report (MMWR). [37]

WBDOSS and the public health community work together to look into the causes of contaminated water leading to waterborne disease outbreaks and maintaining those outbreaks. [37] They do so by having the public health community investigating the outbreaks and WBDOSS receiving the reports. [37]

Society and culture

Socioeconomic impact

Waterborne diseases can have a significant impact on the economy. People who are infected by a waterborne disease are usually confronted with related healthcare costs. This is especially the case in developing countries. On average, a family spends about 10% of the monthly households income per person infected. [39]

Socioeconomic impact refers to the effects that waterborne disease has on society such as the quality of life, medical care, the economy, and education sustainable. [40] Sustainable Development Goal 6, access to clean water and sanitization for all by the year 2030, is at the roots of many of the other sustainable development goals pertaining to society and the economy. [41] Agricultural industries in particular are most severely effected and the increasing stress comes from the booming city populations taking away water from farming. The need for clean water and sanitation is vital because without clean water there is no sustainable food source. Clean water is necessary to produce healthy crops for people to consume. If the water used for crop irrigation is contaminated, the produce could bring a ravaging disease to the people who consume it.

About one third of all of the cities in the world rely on the necessary freshwater that the agriculture industry needs. There is this constant tension on the freshwater supply because as populations in urban areas boom they demand more and more water. This demand for freshwater is estimated to increase 80% in the next 25 years which adds to water stress because farming uses about 72% of the fresh water that the cities need. [42] An example of industries doing their part to help reach Sustainable Development Goal 6 would is the Adopt-a-River Project in Nairobi, Kenya. The United Nations Environment Program worked with several other clubs on the project which consists of traps being established along the Athi River to capture large solid waste. Recycling stations will also be constructed and industries that dump their effluent into water sources will also join the effort. This is a step to remove extra waste from water reducing chances of contamination of water that would eventually be used for irrigation of crops. [42]

History

Waterborne diseases were once wrongly explained by the miasma theory, the theory that bad air causes the spread of diseases. [43] [44] However, people started to find a correlation between water quality and waterborne diseases, which led to different water purification methods, such as sand filtering and chlorinating their drinking water. Founders of microscopy, Antonie van Leeuwenhoek and Robert Hooke, used the newly invented microscope to observe for the first time small material particles that were suspended in the water, laying the groundwork for the future understanding of waterborne pathogens and waterborne diseases. [45]

See also

References

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