Background: Hydatid cysts are encountered frequently in regions endemic with livestock. The basic treatment for a hydatid cyst is total surgical removal of the cyst and its inner contents. Hypertonic NaCl or diluted betadine solution are used as germicidal agents for most hydatid surgeries. However, the germicidal efficacy of the Ankaferd Blood Stopper (R) (ABS) has not been investigated. Thus, we compared the efficacy of ABS for hydatid cysts with that of other germicidal agents.