There are no parasites in frogs, nor in snails in general. Frogs can be eaten after removing their internal organs. However, it is best to eat less frogs, frogs can eat a lot of pests, the protection of crops and fisheries are beneficial. Snails can be kept for a few days before consumption. It can be eaten after the snails spit out the silt and sand in their bodies. However, the snails along the Yangtze River are divorced by a large number of schistosomes. The schistosoma in the body of the snail can be said to be the most harmful of all the parasites, it will be in the human swimming and bathing in the water when the human skin into the human liver, absorb human blood, patients with schistosomiasis, usually suffer from hepatosplenomegaly, and finally died. Before liberation, there were many people suffering from this disease. So if you want to eliminate schistosomiasis, you have to eliminate the nail snail. Now after humans kill the nail snail. There is almost no human schistosomiasis. But in many poor villages, there are still a lot of patients with schistosomiasis. So the national government has to take several steps to implement policies to kill the remaining small number of snails. So as long as it is not a nail snail, any snail can be eaten, and there is no parasite in the body.