CDC / SCIENCE PHOTO LIBRARY CDC / SCIENCE PHOTO LIBRARY
Schistosomiasis parasite life cycles. Diagram showing the life cycle of the parasitic flukes (Schistosoma sp.) that cause schistosomiasis. The intermediate host of the worm is a freshwater snail. Humans become infected through contaminated water. Initial infection is usually asymptomatic, but may cause itching. Later symptoms are dependent on the location of the worm's eggs within the body. They can include live enlargement, abdominal pain, diarrhoea, blood in the urine and vaginal bleeding.
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