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AGRICULTURAL BACTERIOLOGY 



ease have given rise to the terms going light and rheuma- 

 tism. Unlike mammalian tuberculosis, post-mortem changes 

 of the disease are found chiefly in the abdominal cavity. 

 The liver is often dotted with yellow necrotic areas, which 

 has caused the expression spotted liver to be commonly used. 



Fig. 52. Avian Tuberculosis 



A tubercular liver. The organ is greatly enlarged. The yellow areas give 

 rise to one of the common names applied to the disease, spotted liver 



This organ is often much increased in size. The spleen is 

 usually enlarged and frequently abnormal in shape. On 

 section, the normal tissue may be found to be almost wholly 

 destroyed. The intestinal wall may be studded with tuber- 

 cles of varying size. In the more advanced cases the lesions 

 will be found in other organs, such as the kidneys, lungs, 

 and ovaries. 



