**Abstract**

*Overview on Echinococcosis*

2011;**52**(10):1868-1876

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**46**

*Echinococcus granulosus* is also called the hydatid worm, which a parasite that infects humans and animals. It causes zoonotic disease known as echinococcosis (hydatidosis). Adult worms live in the intestines of dogs that are the definitive host. Hydatidosis is known since ancient times and is one of the epidemic diseases that is dangerous to humans in terms of health and economy in most countries of the world. Hydatidosis or echinococcosis unilocular is common in many Arab countries, including Libya, Sudan, Egypt, Lebanon, Syria, Algeria, Palestine, Iraq, and others as well as North, East, and South Africa, Western and Southern Europe, and South America. Studies indicate that the disease is spreading in areas that were previously completely free of it such as North America and Canada. It was also noted that the incidence of the disease in rural areas is close to 50%, and this is due to the large breeding of farm animals and the presence of meat eaters, which helps to complete the life cycle of this parasite, which needs the intermediate host (farm animals and humans) and the definitive host (Canidae).

**Keywords:** *E. granulosus*, hydatid worm, echinococcosis, hydatidosis, zoonotic disease
