what parasitic disease affects most humans worldwide
ShareCompartir. Schistosomiasis, also known as bilharzia, is a disease caused by parasitic worms. Although the worms that cause schistosomiasis are not found in the United States, more than 200 million people are infected worldwide.In terms of impact this disease is second only to malaria as the most devastating parasitic disease.Schistosomiasis is considered one of the Neglected Tropical Diseases (NTDs) .The parasites that cause schistosomiasis live in certain types of freshwater snails.n terms of impact this disease is second only to malaria as the most devastating parasitic disease. Schistosomiasis is considered one of the Neglected Tropical Diseases (NTDs) . The parasites that cause schistosomiasis live in certain types of freshwater snails.