375.Raillietinosis is a cestodosis characterized by diarrhoea (sometimes bloody) during the acute stage and emaciation to cachexia and anaemic during the chronic stage. It is caused by some representatives of the Raillietina genus that parasitize in various areas of the small intestine. The usual inter¬mediate hosts are ants or other insects. Pathoanatomically, haemorrhages with various intensities in the intestinal mucosa, catarrhal haemorrhagic enteritis and the parasites themselves are found out throughout the gross examination. The treatment and the control are done by dehelminthization of all birds in the affected farm.