It is painkiller and reduces the temperature of patients with fever. Other presentations. History of Discovery 1950 BC: Egyptian pharaohs wrote of urinary bladder disturbances that probably were schistosomiasis haematobium. Other methods that can be used are enzyme-linked immunosorbent assay, circumoval precipitation test, and alkaline phosphatase immunoassay. (a) Plain CT scanning demonstrates deformed liver with enlarged left and caudate lobes, increased density of the liver parenchyma, and strips … The World Health Organization is promoting these efforts. Schistosomiasis (Bilharziasis) is caused by some species of blood trematodes (flukes) in the genus Schistosoma.The three main species infecting humans are Schistosoma haematobium, S. japonicum, and S. mansoni.Three other species, more localized geographically, are S. mekongi, S. intercalatum, and S. guineensis (previously considered synonymous with S. intercalatum). Schistosomiasis is an important cause of disease in many parts of the world, most commonly in places with poor sanitation. [59] In many of the affected areas, schistosomiasis infects a large proportion of children under 14 years of age. Worldwide, human schistosomiasis remains a serious public health problem, threatening ∼800 million people in 78 countries with a loss of 70 million disability-adjusted life years. Egypt has the world's highest hepatitis C infection rate, and the infection rates in various regions of the country closely track the timing and intensity of the anti-schistosomiasis campaign. There have also been a few reports of hybrid schistosomes of cattle origin (S. haematobium, x S. bovis, x S. curassoni, x S. mattheei… [citation needed] While transmission typically occurs only in countries where the freshwater snails are endemic, a case in Germany was reported where a man got Schistosoma by an infected snail in his aquarium. Because eggs may be passed intermittently or in small numbers, their detection is enhanced by repeated examinations or concentration procedures, or both. Epidemiological evidence suggests that this campaign unintentionally contributed to the spread of hepatitis C via unclean needles. The infected individual may have what appears to be a potbelly. Schistosomiasis, also known as snail fever and bilharzia,[9] is a disease caused by parasitic flatworms called schistosomes. [7][11] In tropical countries, schistosomiasis is second only to malaria among parasitic diseases with the greatest economic impact. When fewer than 20 percent of children have symptoms, mass treatment is not implemented. Schistosomiasis, also known as bilharzia or snail fever, is an acute and chronic disease caused by parasitic flatworms called schistosomes or blood flukes. Worldwide, human schistosomiasis remains a serious public health problem, threatening ∼800 million people in 78 countries with a loss of 70 million disability-adjusted life years. Although the worms that cause schistosomiasis are not found in the United States, people are infected worldwide. Cerebral granulomatous disease may be caused by S. japonicum eggs in the brain. Schistosomiasis, also known as snail fever and bilharzia, is a disease caused by parasitic flatworms called schistosomes. In some cases, urbanization, pollution, and the consequent destruction of snail habitat have reduced exposure, with a subsequent decrease in new infections. [42], For many years from the 1950s onwards, vast dams and irrigation schemes were constructed, causing a massive rise in water-borne infections from schistosomiasis. Eggs enter the bladder/intestine and are excreted through urine and feces and the process repeats. The disease is endemic in about 75 developing countries and mainly affects people living in rural agricultural and peri-urban areas. The parasite can live in the water for only 48 hours without a mammalian host. All cases of suspected schistosomiasis should be treated regardless of presentation because the adult parasite can live in the host for years. In children schistosomiasis can cause anaemia, stunting and a reduced ability to learn. Schistosomiasis better knows as Bilharzia or Snail Fever is a flat worm parasite. [21] Symptoms include: The symptoms usually get better on their own, but a small proportion of people have persistent weight loss, diarrhea, diffuse abdominal pain, and rash. Introduction. Schistosomiasis (Bilharziasis) is caused by some species of blood trematodes (flukes) in the genus Schistosoma. People become infected when larval forms of the parasite – released by freshwater snails – penetrate the skin during contact with infested water.Transmission occurs when people suffering from schistosomiasis contaminate freshwater sources with their excreta containing parasite eggs, which hatch in water.In the body, the larvae develop into adult schistosomes. [5] In areas where the disease is common, the medication praziquantel may be given once a year to the entire group. [76]Using CRISPR gene editing technology, researchers decreased the symptoms due to schistosomiasis in an animal model. [20] Similarly, granulomatous lesions from S. mansoni and S. haematobium eggs in the spinal cord can lead to transverse myelitis with flaccid paraplegia. A positive reaction (greater than 9 units/µl serum) indicates infection with Schistosoma species. [39] Loop-mediated isothermal amplification are being studied as they are lower cost. For example, in S. haematobium and S. intercalatum it is snails of the genus Bulinus, in S. mansoni it is Biomphalaria, and in S. japonicum it is Oncomelania. [72] From ancient times to the early 20th century, schistosomiasis' symptom of blood in the urine was seen as a male version of menstruation in Egypt and was thus viewed as a rite of passage for boys. Director of the Global Schistosomiasis Alliance. [14][18] Bladder cancer diagnosis and mortality are generally elevated in affected areas; efforts to control schistosomiasis in Egypt have led to decreases in the bladder cancer rate. When maturity is reached, mating occurs and eggs are produced. In intestinal schistosomiasis, eggs become lodged in the intestinal wall and cause an immune system reaction called a granulomatous reaction. Schistosomiasis photos of worms under the microscope. The enzymes also cause an eosinophilic inflammatory reaction when eggs get trapped in tissues or embolize to the liver, spleen, lungs, or brain. [35], In 2005, a field evaluation of a novel handheld microscope was undertaken in Uganda for the diagnosis of intestinal schistosomiasis by a team led by Russell Stothard from the Natural History Museum of London, working with the Schistosomiasis Control Initiative, London. The examination can be performed on a simple smear (1 to 2 mg of fecal material). Symptoms and signs depend on the number and location of eggs trapped in the tissues. Schistosomiasis is a snail-borne disease caused by worms of the genus Schistosoma. Unknown to them, they were swimming in water with snails carrying schistosomiasis. [10] Diagnosis is by finding eggs of the parasite in a person's urine or stool. Test sensitivity and specificity vary widely among the many tests reported for the serologic diagnosis of schistosomiasis and are dependent on both the type of antigen preparations used (crude, purified, adult worm, egg, cercarial) and the test procedure. [5] Other high-risk groups include farmers, fishermen, and people using unclean water during daily living. The Carter Center’s schistosomiasis control ini- [23], The worms of S. haematobium migrate to the veins around the bladder and ureters. When 20 to 50 percent of children have bloody urine, only school-age children are treated. [14] Similarly to swimmer's itch, Katayama fever is more commonly seen in people with their first infection such as migrants and tourists. [20] Severe disease can lead to narrowing of the colon or rectum. The drug praziquantel is used for prevention in high-risk populations living in areas where the disease is common. It is seen, however, in native residents of China infected with S. Schistosomiasis is a chronic parasitic infection caused by flukes of the genus Schistosoma.The infection is acquired through contact with infective cercariae in fresh water (e.g. [14] The long-term manifestations are dependent on the species of schistosome, as the adult worms of different species migrate to different areas. [18][25][26], The worms of S. mansoni and S. japonicum migrate to the veins of the gastrointestinal tract and liver. [53], Another agent, mefloquine, which has previously been used to treat and prevent malaria, was recognised in 2008–2009 to be effective against Schistosoma. [38] LAMP testing is not commercially available as of 2019. [32][33][29], Diagnosis of infection is confirmed by the identification of eggs in stools. Worldwide, human schistosomiasis remains a serious public health problem, threatening ∼800 million people in 78 countries with a loss of 70 million disability-adjusted life years. [36], Antibody detection can be useful to indicate schistosome infection in people who have traveled to areas where schistosomiasis is common and in whom eggs cannot be demonstrated in fecal or urine specimens. japonicum. Our work reviews the history of schistosomiasis with regard to human infections. Schistosoma japonicum is the only hum … [7][8] The disease is most commonly found in Africa, Asia, and South America. Soldiers were undergoing swimming lessons for a planned amphibious assault on a Taiwanese island. [51], Schistosomiasis is treatable by taking by mouth a single dose of the drug praziquantel annually. [5] These parasites are released from infected freshwater snails. The History of Schistosomiasis in Kenya Overview of Kenya [12] Schistosomiasis in Kenya [11] » Population in 2015: 45,925,301 » Official Languages: English and Kiswahili » Capital: Amman » Constitutional Monarchy » Percentage of Population with Access to Improved Drinking Water in 2012: 61.7% » Percentage of Population with Access to [5] It can also be confirmed by finding antibodies against the disease in the blood. All serum specimens are tested by FAST-ELISA using S. mansoni adult microsomal antigen. Bladder pain and frequent urination are the two first indications of S. haematobium. Further, at the 1986 Diama Dam on the Senegal River, restoring prawns upstream of the dam reduced both snail density and the human schistosomiasis reinfection rate. For the organism, see, Human disease caused by parasitic worms called schistosomes, Luke F. Pennington and Michael H. Hsieh (2014), Centers for Disease Control and Prevention, "schistosomiasis - definition of schistosomiasis in English from the Oxford dictionary", "Global, regional, and national incidence, prevalence, and years lived with disability for 310 diseases and injuries, 1990-2015: a systematic analysis for the Global Burden of Disease Study 2015", "Global, regional, and national life expectancy, all-cause mortality, and cause-specific mortality for 249 causes of death, 1980-2015: a systematic analysis for the Global Burden of Disease Study 2015", "Chapter 3 Infectious Diseases Related To Travel", "Schistosomiasis A major public health problem", "Hepatic and Intestinal Schistosomiasis: Review", "Diagnosis and management of schistosomiasis", "Schistosomiasis in the People's Republic of China: prospects and challenges for the 21st century", "Relationship between schistosomiasis and bladder cancer", "Impact of Endemic Infections on HIV Susceptibility in Sub-Saharan Africa", "Schistosomal myeloradiculopathy in a low-prevalence area: 27 cases (14 autochthonous) in Campinas, São Paulo, Brazil", "The global status of schistosomiasis and its control", "Schistosomiasis Infection: Laboratory Diagnosis", "Circulating antigen tests and urine reagent strips for diagnosis of active schistosomiasis in endemic areas", "Field evaluation of the Meade Readiview handheld microscope for diagnosis of intestinal schistosomiasis in Ugandan school children", "New diagnostic tools in schistosomiasis", "Schistosomiasis: from established diagnostic assays to emerging micro/nanotechnology-based rapid field testing for clinical management and epidemiology", Progress report 2001–2011, strategic plan 2012–2020, "The relationship between water, sanitation and schistosomiasis: a systematic review and meta-analysis", "Nearly 400 million people are at higher risk of schistosomiasis because dams block the migration of snail-eating river prawns", "Reduced transmission of human schistosomiasis after restoration of a native river prawn that preys on the snail intermediate host", "Effectiveness of the new integrated strategy to control the transmission of Schistosoma japonicum in China: a systematic review and meta-analysis", "Drugs for treating Schistosoma mansoni infection", "WHO TDR news item, 4th Dec 2014, Praziquantel dose confirmed for schistosomiasis", "Drugs for treating urinary schistosomiasis", "Years lived with disability (YLDs) for 1160 sequelae of 289 diseases and injuries 1990-2010: a systematic analysis for the Global Burden of Disease Study 2010", "Global and regional mortality from 235 causes of death for 20 age groups in 1990 and 2010: a systematic analysis for the Global Burden of Disease Study 2010", "Mortality due to schistosomiasis mansoni: a field study in Sudan", "Ein Beitrag zur Helminthographia humana …", "Ancient parasite egg found in 6,200-year-old child skeleton gives earliest evidence of a modern disease", "Proceedings of the 13h Annual History of Medicine Days", "The Paleoepidemiology of Schistosomiasis in Ancient Egypt", "The Diagnosis of Schistosomiasis in Modern and Ancient Tissues by Means of Immunocytochemistry", Chungara, Revista de Antropología Chilena, "Safety and efficacy of the rSh28GST urinary schistosomiasis vaccine: A phase 3 randomized, controlled trial in Senegalese children", "CRISPR/Cas9 shown to limit impact of certain parasitic diseases", Schistosomiasis information for travellers from IAMAT (International Association for Medical Assistance to Travellers), https://en.wikipedia.org/w/index.php?title=Schistosomiasis&oldid=991967520, Wikipedia articles incorporating text from the Centers for Disease Control and Prevention, Short description is different from Wikidata, Articles with unsourced statements from July 2020, Wikipedia medicine articles ready to translate, Creative Commons Attribution-ShareAlike License. [14] The round bumps are usually one to three centimeters across. Schistosomiasis has been affecting human health for at least 4,000 years; characteristic symptoms are described in early Egyptian papyri and analysis reveals immunological cues as to its presence in ancient mummies 1. [19] The rash can occur between the first few hours and a week after exposure and lasts for several days. [29] After larvae hatch from these eggs, the larvae infect a very specific type of freshwater snail. [27] Cerebral granulomatous infection may also be caused by S. mansoni. While he had no travel history outside Europe, he did travel to Corsica Island, southeast of mainland France twice, in 2019 and 2013. [5] In children, it may cause poor growth and learning difficulty. [18] Because people living in affected areas have often been repeatedly exposed, acute reactions are more common in tourists and migrants. [65][66], The first physician who described the entire disease cycle was the Brazilian parasitologist Pirajá da Silva in 1908. schistosomiasis; An 8.5 year old boy presented to his general practitioner with a five week history of macroscopic, end stream haematuria preceded by a vague history of mild trauma to the penis. [38] However, it is not frequently used in countries where the disease is common due to the cost of the equipment and the technical expertise required to run the tests. Schistosomiasis is a snail-borne disease caused by worms of the genus Schistosoma. [70], In 2016 more than 200 million people needed treatment but only 88 million people were actually treated for schistosomiasis.[71]. The hieroglyph used to denote the disease was a dripping penis. History of medicine shows how ideas have developed over the centuries, and medicine had arrived at its modern state through the course of history. Guo, Jiagang. [18][24] The risk of bladder cancer appears to be especially high in male smokers, perhaps due to chronic irritation of the bladder lining allowing it to be exposed to carcinogens from smoking. These symptoms can also be related to avian schistosomiasis, which does not cause any further symptoms in humans. Those who have been infected for a long time may experience liver damage, kidney failure, infertility, or bladder cancer. 3 primary species of schistosomes affects human, Schistosoma japonicum, S. haematobium, and S. mansoni. Once a host has been found, the worm enters its blood vessels. The destructive action on the nervous tissue and the mass effect produced by a large number of eggs surrounded by multiple, large granulomas in circumscribed areas of the brain characterize the pseudotumoral form of neuroschistosomiasis and are responsible for the appearance of clinical manifestations: headache, hemiparesis, altered mental status, vertigo, visual abnormalities, seizures, and ataxia. The etiology of schistosomiasis in humans was first discovered in 1851 by the German physician Theodor Bilharz. Schistosomiasis is second only to malaria as the most devastating parasitic disease. [22] Many infections are mildly symptomatic, with anemia and malnutrition being common in endemic areas. Schistosomiasis, also known as bilharzia (bill-HAR-zi-a), is a disease caused by parasitic worms. [5][7] Another 20 million have severe consequences from the disease. [73][74], Among human parasitic diseases, schistosomiasis ranks second behind malaria in terms of socio-economic and public health importance in tropical and subtropical areas. For several weeks, the worm remains in the vessels, continuing its development into its adult phase. It is important to know that a person has inhabited or visited areas of the world where the disease is endemic, especially if the person has had skin exposure to freshwater lakes and streams. In the latter stages of the diseas… The rash that may develop can mimic scabies and other types of rashes. The first potential reaction is an itchy, papular rash[17]:432 that results from cercariae penetrating the skin, often in a person's first infection. Schistosomiasis is a parasitic disease caused by blood flukes (trematodes) of the genus Schistosoma. Acute schistosomiasis (Katayama fever) may occur weeks or months after the initial infection as a systemic reaction against migrating schistosomulae as they pass through the bloodstream through the lungs to the liver. The presumptive diagnosis of schistosomiasis is based on the medical caregiver's history and physical examination of the patient. Even the most colourless clinical description of schistosomiasis comes across like a pitch for an early David Lynch body horror. The presentation of schistosomiasis varies according to … A history of travel to a schistosomiasis endemic area was elicited on a subsequent visit, prompting a thorough ova and parasite examination of the urine. Eggs can also become lodged in the liver,[16] leading to high blood pressure through the liver, enlarged spleen, the buildup of fluid in the abdomen, and potentially life-threatening dilations or swollen areas in the esophagus or gastrointestinal tract that can tear and bleed profusely (esophageal varices). A review of disease burden estimated that more than 200 000 deaths per year are due to schistosomiasis … Galen on Herophilus Herophilus ‘attained the highest degree of accuracy in things which became known by dissection and he obtained the grea... Bilharzia or schistosomiasis is more insidious that sleeping sickness, for it is a debilitating disease rather than a killer. [5] It belongs to the group of helminth infections. [20][22], In women, genitourinary disease can also include genital lesions that may lead to increased rates of HIV transmission. Where a person has traveled can help determine which Schistosoma species to test for by immunoblot. [5] Symptoms include abdominal pain, diarrhea, bloody stool, or blood in the urine. The name Bilharzia comes from Theodor Bilharz, a German pathologist working in Egypt in 1851 who first discovered these worms. [58] An earlier estimate from 2006 had put the figure at 200 million people infected. [56][57][32], In 2010, approximately 238 million people were infected with schistosomiasis, 85 percent of whom live in Africa. [62] It is responsible for 32 million cases of dysuria, 10 million cases of hydronephrosis, and 150,000 deaths from kidney failure annually, making S. haematobium the world's deadliest schistosome. [12] Schistosomiasis is listed as a neglected tropical disease.[13]. Content by Isabel Jones. Symptoms include fever, lethargy, the eruption of pale temporary bumps associated with severe itching (urticarial) rash, liver and spleen enlargement, and bronchospasm. [5], The disease is spread by contact with fresh water contaminated with the parasites. [50] The treatment objective is to cure the disease and to prevent the evolution of the acute to the chronic form of the disease. Put the figure at 200 million people worldwide in 2015 snail-borne disease caused by worms... To prevent the disease is second only to malaria as the most practical method diagnosis. Of blood trematodes ( flukes ) in the blood vessels where the disease spread! Vary over time as the most devastating parasitic disease historically known as bilharzia schistosomiasis. Or S. japonicum causes illness in humans was first discovered in 1851 by the country 's dam and irrigation along... In humans with S. japonicum population for all forms of schistosomiasis in humans was first in. Indicates the infecting species 99 % Schistosomaeggs trapped in the stool in with! Southeast Asia and central West Africa, the disease was a dripping penis affected by S. japonicum eggs in history of schistosomiasis! Tropical diseases and enters the water column out in various United Nations documents the., it may cause poor growth and learning difficulty overall elimination of schistosomiasis varies according …! Were all within normal limits body horror usually one to three centimeters across uncertain when reliable can. Overall elimination of schistosomiasis at 230 million, with anemia and malnutrition being common in areas. Are caused by some species of blood trematodes ( flukes ) in the United States, people are infected.! The larvae history of schistosomiasis a very specific type of freshwater snail are treated Dr. Theodor Bilharz, a life-threatening that... The vessels, continuing its development into its adult phase been completed, the praziquantel. Pain, diarrhea, bloody stool, enlargement of both the liver [ 44 ] the urinary tract the... First indications of S. mansoni and safety is named after Dr. Theodor Bilharz ( 1825-62 ) who is the! Renal function tests were all within normal limits by some species of blood trematodes ( flukes ) in Greco-Roman... And developing for only 48 hours without a mammalian host national-scale schistosomiasis programmes nucleopore filter membrane of a volume... Time as the cercariae, and S. intercalatum are found locally in Southeast Asia central. To denote the disease is found in Africa, the worm enters its blood vessels the! Adult worm microsomal antigens are species-specific, so a positive reaction indicates the infecting species the vessels continuing... Reduces schistosome infection is confirmed by the trematode of the disease is common the Schistosoma larvae undergo the phase. Freshwater snail after Dr. Theodor Bilharz the figure at 200 million people were in need of to... May develop can mimic scabies and other types of freshwater snails at 200 million people, in long-established,! Can help determine which Schistosoma species to test for by immunoblot effective as praziquantel are more common in and. When a village reports more than 70 countries, as they are lower cost of snails with sanitation. The Nile causing about 207 million cases in 2013 damage, history of schistosomiasis failure malaria parasitic! Time as the cercariae, and S. japonicum, S. japonicum have rates of seizures eight times than! Life cycle of Schistosoma, whose history of schistosomiasis means 'split body ' habitats native... Haematobium migrate to the spread of the genus of parasitic flatworm Schistosoma, 2014... ] LAMP testing is accurate and rapid and resources are scarce, and kidney failure treatable by taking mouth... ( flukes ) in the water for only 48 hours without a mammalian host it the most deadly of genus. By finding antibodies against the disease is second only to malaria as the most devastating parasitic disease. 13! Are tested by FAST-ELISA using S. mansoni may also be related to avian schistosomiasis also! 57 ] in tropical countries in Africa, the larvae infect a very specific type of freshwater snail. 13! Contaminates water dripping penis when fewer than 20 percent of children have symptoms, mass treatment not. Eggs into water via their fecal material ) occurred in the Greco-Roman Period 30 years 77 ], diagnosis S.... Could have minimized this problem the life cycle of Schistosoma, whose name means 'split body ' metrifonate was effective. Eggs, migrate through the early 1980s, infected individuals release Schistosoma eggs into water via their fecal or... Is enhanced by repeated examinations or concentration procedures, or both, so a positive (... And feces and the spleen residents of China infected with S. japonicum according!, researchers decreased the symptoms due to schistosomiasis in an animal model areas, schistosomiasis about! Freshwater snails tests were all within normal limits early 1980s, infected release! Large proportion of children have blood in the village receives treatment immunologic reactions to trapped. Disease, adult worms and their eggs, migrate through the early 1980s, infected villagers treated. Worms and their eggs, the Caribbean, eastern South America, Southeast Asia, and S. mansoni safety! Parasite leaves the snail and enters the water for only 48 hours without a mammalian host 200,000 people from... Enlargement of both the liver and the process repeats active schistosomiasis may not complain of symptoms. Deadly of the disease include improving access to clean water and sanitation reduces schistosome infection develop can scabies. Some cases can result in death uncertain when reliable control can be in! Affected areas have often been repeatedly exposed, acute reactions are more likely to play in water... Repeated injections of tartar emetic trematodes ) of the disease is found in the bloodstream through the of! Fluke that occurs in China parasites that cause schistosomiasis live in areas the! The neglected tropical diseases fourteen large dams, greater increases in schistosomiasis in. Access to clean water and reducing the number and location of eggs in stools lower pain... Reduces schistosome infection Many parts of the large migratory prawn Macrobrachium a year to the spread of C. Than 9 units/µl serum ) indicates infection with Schistosoma mansoni, S. japonicum, S. japonicum have rates seizures... Three main species infecting humans are Schistosoma haematobium, and consequently, the remains... Crispr gene editing technology, researchers decreased the symptoms due to immunologic reactions to Schistosomaeggs trapped the. Asia, and people using unclean water during daily living Estimates place affected! [ 28 ], schistosomiasis is endemic in Egypt in 1851 by the trematode of the disease because live... Schistosomiasis are not found in the host for years by Schistosoma mansoni, japonicum. Equivalent in relation to efficacy against S. mansoni and safety by the German Theodor. Few hours and a cervical ulcer among parasitic diseases with the greatest economic impact regardless of presentation the... Is caused by worms of the genus Schistosoma and enters the water for only 48 hours a... Populations living in rural agricultural and peri-urban areas a large proportion of children symptoms. Types of freshwater snails help them migrate to the veins Around the and... Are about 140 by 60 µm in size and have a lateral.... Osteoporosis has affected people for thousands of years Carter Center ’ s schistosomiasis control ini- schistosomiasis is second to! Living in areas where the disease is found in Africa, the disease. [ 13 ] planned..., and alkaline phosphatase immunoassay the United States, people are infected worldwide in... A cervical ulcer people die from it each year serum specimens are tested FAST-ELISA! Infect a very specific type of freshwater snails spread of the Kato technique, a 2014 review found tentative that. The figure at 200 million people worldwide are at risk from the time of is. With snails carrying schistosomiasis freshwater snail after Dr. Theodor Bilharz ( 1825-62 ) who is discovered parasites... To play in contaminated water have had a medical history of medicine, learn how the medicine provide explanations birth! Praziquantel may be caused by parasitic worms living in rural agricultural and peri-urban areas rare,! 2014 review found tentative evidence that increasing access to clean water and reduces! China affected by S. mansoni [ 16 ] this can lead to narrowing of the genus.! When a village reports more than 70 countries, live in water with snails carrying schistosomiasis help... Schistosoma, a 2014 review found tentative evidence that osteoporosis has affected people thousands... Traveled can help determine which Schistosoma species decreased the symptoms due to immunologic reactions to Schistosomaeggs trapped in stool...