Schistosome infected people or other mammals from the discharge of faecal egg, if manure contaminated the water, eggs were brought into the water, hatched miracidium in the water.

感染血吸虫的它哺乳动从粪便中出虫卵，若粪便污染了水，虫卵被带进水中，在水里孵出毛蚴。