Schistosomes are a type of parasitic flatworm belonging to the class Trematoda. They are known for causing a disease called schistosomiasis, which affects millions of people worldwide. These worms live in freshwater environments and can enter the human body through the skin when a person comes into contact with contaminated water. Once inside, schistosomes migrate through the bloodstream and can reside in various organs, particularly the liver and intestines. Symptoms of schistosomiasis can include abdominal pain, diarrhea, and blood in the urine or stool. Treatment typically involves medications that target the parasites, helping to alleviate symptoms and prevent complications.