Diseases of Hogs. 153 



condition produces inflammation (peritonitis), causing 

 death. In this type the spleen is not usually enlarged 

 and the lungs are normal. 



Hogs are subject to intestinal troubles that are often 

 mistaken for cholera, but may be differentiated from it 

 through the fact that they do not spread to other herds. 

 The trouble may be produced by unsuitable food, such as 

 house refuse containing much soap. Often the mortality 

 with such troubles is high, and the rapid death of the 



FIG. 18. HOG CHOLERA. 



Button ulcers on the inner wall of the intestine in 

 a case of chronic hog cholera. (After Reynolds.) 



animals causes the farmer to think a contagious disease 

 is present. The term ''swill-barrel" cholera is often 

 used for such outbreaks. 



Prevention. As there is no cure for the disease, the 

 owner must devote his efforts to prevention. The dis- 

 ease may be brought onto a farm in a number of ways, 

 most frequently, through the purchase of animals. As 

 previously stated animals recover from the disease. 

 Such animals may harbor the disease-producing bacteria 

 in their bodies and disseminate them subsequent to ap- 

 parent recovery As soon as such animals are brought 



