DISEASES OF THE ■ DIGESTIVE TRACT 87 



the mucous lining. There will also be noted a straw-colored 

 fluid -(edema, dropsy) in the loose tissue about the heart. 



Fig. 28, taken from an area in the edge of the necrotic 

 portion marked B, in Fig. 27, illustrates the condition. A 

 illustrates the liver cells as they are first affected (cloudy 

 swelling) ; B, the cells farther along in the disease process 

 in which it may be noted that the nucleus has disappeared 

 and the cell is disintegrating (necrosis) ; C, the congested 

 vessels (passive cpngestion); D, white blood cells (eosino- 

 philes) referred to above. There may also be noted in these 

 areas giant cells. 



A-^ 



^-B 



Fig. 28. Cloudy Swelling Due to Enterohepatitis 

 This is a Section from "B" in Fig. 27 (magnified 900 



times) . 

 A, Liver cells (cloudy swelling). B, liver cells under- 

 going disintegration, necrosis. C, congested blood 

 vessel. D, white blood cells, eosinophiles abundant 

 in this disease. E, protozoa causing the disease. 



Fig. 29 illustrates a giant cell. B, ppotozoa causing the 

 disease. A like microscopic examination of sections from 

 the kidneys indicates that poisonous products have been taken 

 up by the blood, for in these sections we find degenerative 

 changes (congestion, cloudy swelling and focal necrosis). 



Fig. 30 shows a microscopic field from a blood smear from 

 a turkey affected by entero-hepatitis with the disease. It 

 will be noted that there is an intense eosinophilia. Fig. 31 

 shows a field from a portion of the kidney, in a state of 

 cloudy swelling and focal necrosis — evidence of absorbed poi- 

 sonous substance. Fig. 32 shows one of the ceca with a small 

 ulceration caused by the protozoa. 



Symptoms. — Entero-hepatitis is most common in 

 turkeys between the ages of one month an(3 one 



