Enzootic in animal husbandry is an acute infectious disease of animals of the monohoofed group (horses, deer, pigs, etc.), caused by parasites from the class of roundworms of the nematode family. Since roundworms are mainly spread through meat and products from sick animals, the enzootic is often called a parasitic zooanthroponosis. Enzootic invasion is a natural source of infection. The course of the disease and the nature of infection depend on a number of factors, such as the age composition of the herd, the degree of health of the livestock, the system of procurement and storage of feed, features of animal care, etc.