Schistosomiasis is an acute and chronic parasitic disease caused by blood flukes (trematode worms) of the genus Schistosoma. People become infected when larval forms of the parasite – released by freshwater snails – penetrate the skin during contact with infested water. Preventive treatment and measures, which should be repeated over a number of years, will reduce and prevent morbidity. Therefor, people can be infected again.

Article Immunology of Human Schistosomiasis