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Human echinococcosis (hydatidosis, or hydatid disease) is caused by the larval stages of cestodes (tapeworms) of the genus Echinococcus. Echinococcus oligarthrus is an extremely rare cause of human echinococcosis that occurs in Central and South America.
Echinococcus oligarthrus (adults up to 2.9 mm long) has a life cycle that involves wild felids as definitive hosts and rodents as intermediate hosts. Humans become infected by ingesting eggs, with resulting release of oncospheres in the intestine and the development of cysts in various organs.