**3. Larval stage (hydatid cyst)**

When intermediate hosts (farm animals) or humans (accidental host) ingest the eggs, the embryo (oncospheres) hatches and becomes active, transmitted by the bloodstream to the liver or any other organ. As soon as the hexacanth embryo reaches its definitive position, it develops into unilocular hydatid cyst that enlarges and produces daughter cysts or protoscoleces inside the inner layer of the hydatid cyst [10, 11].
