After cooking, the shell is removed, and the fried snails have no parasites. Snails will not be parasitic when cooked. After 5 minutes of high-temperature cooking, parasites in snails can be effectively killed. Snails can be infected with parasites if they are not cooked. Epidemiologically, the parasite in Oncomelania hupensis is generally Schistosoma japonicum, so if it is not completely killed, it will easily lead to schistosomiasis and cause harm to human body. But usually snails can kill parasite eggs in 20 minutes after frying and cooking, so that they can no longer be transmitted to people.