Sources and reservoirs Infection of water bags or vesicles .. Dog feces. Gastrointestinal stage of dogs and carnivores

1 - dog feces containing the worm eggs causing the disease.
2 - the stage of the larva (Hydatid), which is found in the members of animals herbivores, the stage of infection of dogs and other meat eaters (the final host) and sheep are the main intermediary host followed by importance of cattle and beauty and other animals of the offspring.