DIFFERENTIAL DIAGNOSIS 



211 



tubercle, and in others to have resulted from the coalescence 

 of a number of small ones. The necrotic center and reaction- 

 ary zone of round cells are beautifully demonstrated by their 

 reaction to nuclear stains. 



§ 152. Differential diagnosis. Tuberculosis in cattle 



Fig. so. a photograph of the head and part of the neck of a 

 tuberculous fowl. 



and swine is to be differentiated from actinomycosis, glanders, 

 and various parasitisms resulting in nodules largely in the 

 walls of the intestine. In cattle the nodules are produced by 

 an Oesophagostoma. In sheep the nodules are caused by 



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