Hydatid disease due to cystic echinococcosis (CE) is one of the most important public-health and economic problems in Turkey. Human CE occurs throughout Turkey whereas alveolar echinococcosis (AE) predominantly occurs in the eastern Anatolian region of the country. Human AE is also endemic in eastern Azarbaijan and northern Iran. Reports of approximately 207 cases of AE and 21,303 cases of CE in Turkey were published over the periods 1962-1995 and 1987-1994, respectively. Most of the data on cases of hydatid disease in Turkey and the Middle East have been collected from hospital records.