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Hydatid disease occurs in an animal when one of the tapeworms passes its larval or cystic stage in that animal's body. The hydatid and its content is the worm in its cystic larval form. And because the tapeworm which more frequently than all others succeeds in utilizing man as its intermediate host is that of the dog, hydatid disease has come to mean infection with Echinococcus granulosus. The cysticercus or hydatid referred to by the term "hydatid disease" is that of this particular tapeworm, frequently referred to as Taenia echinococcus. But only a few of the vast numbers of these worms get into human bodies to spend nearly all their life cycle there as cysts. Man is merely an incidental intermediate host, for the hydatid disease caused by the dog's tapeworm is essentially a disease of sheep. As compared with its customary alternating existence between dogs and sheep, the dog
Hydatid Disease: Its Pathology, Diagnosis and Treatment.. JAMA. 1929;92(16):1377. doi:10.1001/jama.1929.02700420061031