Merriam-Webster Collegiate Dictionary - schistosomiasis

 noun  (plural schistosomiases)  Etymology: New Latin, from Schistosoma  Date: 1906 infestation with or disease caused by schistosomes; specifically a severe endemic disease of humans in Africa and parts of Asia and South America that is contracted when cercariae released into freshwaters (as rivers) by a snail intermediate host penetrate the skin and that is marked especially by blood loss and tissue damage — called also snail fever