Parasitic Diseases Protozoal Diseases 1-Coccidiosis It is common protozoal disease of many species of birds caused by species of genera primarily Eimeria and Isospora and is quite host specific. Etiology: Eimeria tenella (ceca), E. acervulina (upper small int.), E. maxima and E. necatrix (mid small intestine) in chickens. Lesions: -Hemorrhagic enteritis with white to yellow foci or petechial hemorrhages on the serosal. -Micro: Numerous coccidia in different stages of development are seen in the epithelial lining.
Remark: A-Turkeys: common, less severe than in chickens. E. adenoides (ceca), E. meleagrimitis (mid small intestine). -Hemorrhagic or necrotic enteritis. B-Geese: E. truncata occurs in kidneys. Nephritis and urate deposits E. anseris causes enteritis C-Ducks: renal coccidia due to E. boschadis.