The wireworms inside eels can be eaten when cooked, but it is best not to consume them. Threadworms are a common parasite found in eels, loaches and other animals, and are mainly infected by touching or eating cool water, worms, freshwater fish and snails or ingredients with larvae. Generally speaking, eels with wireworms can be killed by heating at a high temperature of over 70 degrees for 4-5 minutes, completely losing their activity as well as infectiousness, so that normal consumption of eels will not cause parasitic infection. Although the nematodes inside the eel can be killed by heating, the eggs can survive for a longer period of time and uniform heating cannot be guaranteed. Infection with wireworms requires prompt medical attention, mainly through medication and localized surgery to kill the worms. Drug treatment is the first choice, through the use of praziquantel, albendazole and other drugs can be killed, so as to discharge from the body; if the cysts have been formed, the parasite can be removed through local surgery. If the cyst has formed, the parasite can be removed by localized surgery. The above medication is in accordance with the doctor’s prescription.