_alveolar echinococcosis (E. multilocularis infection)
_Polycystic echinococcosis (E. vogeli infection)
_Unicystic echinococcosis (E. oligarthrus infection)
_Adult worms in the small intestines of canines
_Embryonated eggs in canines’ feces
_Eggs ingested by the intermediate host (that may be human, sheep, goat, pig etc).
_Oncophere hatches, penetrates intestinal wall into the blood circulation.
_Oncophere moves to varius organs such as lung, liver and to a lesser extent brains.
_Oncophere develops into hydatid cyst.
_Hydatid cyst enlarges slowly with protoscolices and daughter cysts forming within the large cyst.
_A canine ingests cyst-containing tissue of the intermediate host.
_Protoscolices evaginates and attach to the intestinal mucosa as scolex.