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After the construction of fourteen large dams, greater increases in schistosomiasis occurred in the historical habitats of native prawns than in other areas. 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. [59] [60]
Clinical symptoms are caused by the eggs. As the leading cause of schistosomiasis in the world, it is the most prevalent parasite in humans. It is classified as a neglected tropical disease. As of 2021, the World Health Organization reports that 251.4 million people have schistosomiasis and most of it is due to S. mansoni. [1]
Schistosoma is a genus of trematodes, commonly known as blood flukes.They are parasitic flatworms responsible for a highly significant group of infections in humans termed schistosomiasis, which is considered by the World Health Organization to be the second-most socioeconomically devastating parasitic disease (after malaria), with hundreds of millions infected worldwide.
Deaths 20,000–200,000 per year Gastropod-borne parasitic diseases (GPDs) are a group of infectious diseases that require a gastropod species to serve as an intermediate host for a parasitic organism (typically a nematode or trematode ) that can infect humans upon ingesting the parasite or coming into contact with contaminated water sources. [ 1 ]
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In 2009, there were an estimated 200 million human infections of schistosomiasis. [8] In 1999, the noted number of S. intercalatum infections was 1.73 million. [ 9 ]
Serologic surveys for schistosomiasis due to S. malayensis indicate of 3.9% prevalence in rural populations. [6] It was unsuccessful at adapting to human host. Infected rodents are often found near snail habitats. [6] Infections in humans are unlikely and are considered rare.
It is found in Africa and the Middle East. It is the major agent of schistosomiasis, the most prevalent parasitic infection in humans. [1] It is the only blood fluke that infects the urinary tract, causing urinary schistosomiasis, and is a leading cause of bladder cancer (only next to tobacco smoking). [2] [3] The diseases are caused by the eggs.