INFECTIOUS DISEASES 



185 



ceration have been observed as a result of infection with 

 the Bacillus necrophorous, and these lesions have also 

 been observed in swine that had been fed excessive quan- 

 tities of ferrous and copper sulphate. 



The study of the lesions gives assistance in the diag- 

 nosis of cholera. The pneumonic lesions are relatively 

 common in cases of cholera excepting in the peracute 



Fig. 15. ACUTE HOG CHOLERA, (Advanced Stage). 



type. The lesions in the lung consist of croupous pneu- 

 monia in some stages and involve the cardiac and fre- 

 quently the cephalic lobe. This lesion cannot be consid- 

 ered characteristic of cholera as it is the typical lesion of 

 croupous pneumonia, but when it occurs in conjunction 

 with subserous and submucous hemorrhages, congestion 

 and hemorrhages of lymph nodes, and discoloration of 



