Genus Echinococcus is a group of small tapeworms that belong to the family Taeniidae. They are commonly known as hydatid worms, and can cause hydatid disease in humans and other animals. This illness is caused by the larvae of the worm, which form cysts in organs such as the liver, lungs, and brain. Synonyms for Genus Echinococcus include Echinococcus granulosus, Echinococcus multilocularis, and Echinococcus vogeli. These tapeworms can be found worldwide, and are often found in areas where dogs and other canids are present. They are typically transmitted through ingestion of contaminated food or water, or from contact with infected animals. Treatment for hydatid disease typically involves surgical removal of the cysts, followed by medication to kill any remaining larvae.