Feeding embryonated eggs of Heterakis papillosa to brooder chickens led to a disease of both ceca, characterized by the presence of a core consisting of fecal matter, coagulated blood, and emigrated cells from the mucosa. The walls of the ceca were thickened as a result of cell invasion and multiplication, invasion and multiplication of Amoeba meleagridis or allied parasites, and more rarely he...
