Schistosoma enter the human body in different ways according to their different types, common pathogens are Schistosoma japonicum and Schistosoma japonicum, which can be infected through contact with infected water. 1. Schistosoma japonicum: mainly infected by skin contact with infected water containing Schistosoma japonicum tailed larvae. The caecal larvae can invade the body from the skin or mucous membrane in a very short time, and reach the liver through the blood circulation system for parasitization. When ectopic parasitization occurs in the lungs, schistosomiasis can occur. 2. Schistosoma japonicum: the organism is often infected by eating crabs or freshwater crayfish containing the cysts of Schistosoma japonicum in raw or semi-raw form. It can also be infected through the consumption of raw water containing cysts or the transfer of hosts containing cysts. Schistosoma japonicum mainly parasitizes the lungs of the organism and causes pulmonary schistosomiasis. If you feel unwell, it is advisable to seek medical advice and treatment.