178 SWINE DISEASES 



Bacillus coli communis, Spirochseta suis, or some other 

 intestinal infection. This type of hog cholera is charac- 

 terized by the general lesions of the less acute septicemic 

 type plus intestinal lesions which are as follows. The 

 lymphoid tissue of the mucosa of the cecum, colon, and 

 to a less extent in the ileum, becomes tumefied and later 

 undergoes necrosis. The necrotic tissue, remaining ad- 

 herent as a dirty brown mass, has raised margins and 

 represents the so-called hog-cholera ulcer. These necrotic 

 areas may be mere points or they may be as large as a 

 silver dollar or even larger. In exceptional cases the 

 necrosis may extend through the intestinal wall and 

 result in fatal peritonitis or intestinal adhesions. In the 

 chronic intestinal type there is intestinal adhesions, in- 

 volving especially the large intestine, although the small 

 intestines may also evidence the same lesions. There 

 may be a general diffuse diphtheritic inflammation of the 

 mucosa of the intestine and stomach, the exudate cover- 

 ing practically the entire surface of the mucous membrane 

 of the intestine. This organized exudate may become 

 dry or it may become softened and mushlike, the color 

 of the exudate changing from dirty brown to a yellow or 

 greenish yellow. 



In chronic cases the septicemic lesions become modi- 

 fied. The hemorrhages become pigmented areas; the 

 lymph nodules become hyperplastic and frequently necro- 

 tic. The spleen may or may not become extensively 

 enlarged and necrotic, the skin frequently becomes necro- 

 tic and variable sized areas slough, and the ears become 

 tumefied and frequently necrotic, and slough. Tume- 

 faction and necrosis may also occur in the bladder, mouth, 

 pharynx, and in other regions. 



The evidence of a previous attack of this type of hog 

 cholera consists of granulation of the erosions of the 

 mucous membrane of the intestine, stomach, mouth, and 

 elsewhere, and also of granulations of the skin erosions. 

 In other cases there may be scars and an irregular lumen 

 of the intestine due to irregular cicatrization. The lymph 

 nodes will contain caseous necrotic centers. 



