This is a nematode, a parasite. People sometimes come into contact with it. For example, when people run into people's eyes and drink water into people's stomach, larvae infected by the host will have an acute attack. After the incubation period of infection with eggs, the body will have symptoms. Insensitive people will have no symptoms, but they will have anemia, low fever, irritability, headache, rash and other symptoms. It will seriously damage the host's body, change tissues and body fluids, change the genes of the body, and change the texture of skin mucosa and muscles. Many organs of the body are damaged, leading to various complications and life-threatening. Infection routes include eating undercooked meat containing eggs or larvae, entering through unprotected wounds, directly penetrating the skin, passing through blood-sucking animals, etc., mainly animal parasites.