Cystic hydatidosis is an important zoonosis, which is significant in terms of economics and public health. This disease is endemic in Iran and different livestock act as intermediate host. This disease is a serious public health problem and cause economic losses due to abattoir condemnation of infected organs. The aim of this study is to determine the prevalence and fertility rate of liver and lung hydatid cysts of sheep and cattle in northeast of Iran. A total of 3700 sheep and 1673 cattle were inspected and infected livers and lungs were collected. The overall prevalence rate was 1.4% and 6.75% in sheep and cattle, respectively. Hydatid cyst in lung is more than liver cyst in cattle. In sheep, hydatid cysts were recovered from 0.81% of the liver and 0.59% of the lung. Statistical analysis revealed the age-dependent prevalence of hydatid cysts in cattle and infection rate increase with age. Gender is an important factor in both cattle and sheep. The prevalence rate was 5.2% in ewes and 1.13% in rams. In contrast, hydatid cysts were more common in male than female cattle. The highest and lowest rate of fertility were observed in pulmonary cysts of sheep and pulmonary cysts in cattle, respectively. High fertility rate of sheep cysts show the great potential risk of sheep in the mentioned area.

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