 The eggs are passed through the feces of the definitive host and it is the ingestion of these eggs that lead to infection in the intermediate host.From the embryo released from an egg develops a "hydatid cyst", which grows to about 5–10 cm within the first year and is able to survive within organs for years.Cysts sometimes grow to be so large that by the end of several years or even decades, they can contain several liters of fluid.