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Echinococcus granulosus, also called the hydatid worm or dog tapeworm, is a cyclophyllid cestode that dwells in the small intestine of canids as an adult, but which has important intermediate hosts such as livestock and humans, where it causes cystic echinococcosis, also known as hydatid disease.
The tapeworm attaches itself to the wall of the dogs small intestine via a rostellum armed with hooks. Once the tapeworm matures, eggs are released into the intestine and passed in feces. [3] Rodents, such as the paca, serve as the intermediate host. Eggs that are eaten by the rodent form hydatid cysts in the lungs, liver, and other internal ...
The second most common form is alveolar echinococcosis (also known as alveolar colloid of the liver, alveolar hydatid disease, alveolococcosis, multilocular echinococcosis, "small fox tapeworm"), which is caused by Echinococcus multilocularis and the third is polycystic echinococcosis (also known as human polycystic hydatid disease, neotropical ...
It is also approved to prevent flea infestations and heartworm disease in dogs. The drug is approved for the treatment of flea and tick infestations, along with roundworm, hookworm and tapeworm ...
Another strategy is to have very long-lived larvae; for example, in Echinococcus, the hydatid larvae can survive for ten years or more in humans and other vertebrate hosts, giving the tapeworm an exceptionally long time window in which to find another host. [23] Many tapeworms have a two-phase life cycle with two types of host.
The origin of these parasites based on host-parasite co-evolution comparisons was North America or Asia, depending on whether the ancestral definitive hosts were canids or felids. Echinococcus oligarthrus and Echinococcus vogeli are basal in this genus. [6] The genus is a sister to the genus Taenia from which it diverged more than 10 million ...