Schistosomiasis is caused by parasitic flatworms.
People get schistosomiasis by contact with fresh water containing flatworm eggs. Schistosomiasis is treatable. To prevent schistosomiasis, avoid swimming or wading in fresh water when visiting areas where the disease is known to occur. Schistosomiasis is a tropical disease that can cause serious, long-term illness. Schistosomiasis is caused by parasitic flatworms, called schistosomes.