INFECTIOUS DISEASES 



HOG CHOLERA 



Hog Cholera is a common infectious disease of 

 swine, characterized by an inflammation and ul- 

 ceration of the stomach and intestines, enlarged 

 and inflamed C9ndition of the lymphatic glands, 

 and sloughing of portions of the skin. The name 

 hog cholera is frequently applied to a class of 

 infectious diseases in which the symptoms re- 

 semble each other. The investigation carried on 

 by the Bureau of Animal Industry show that 

 there are three diseases belonging to this class : 

 hog cholera and swine plague, with which swine 

 breeders are well acquainted, and a third that 

 resembles the acute form of hog cholera. 



The annual loss from the so-called hog cholera 

 epidemics has been estimated at from $10,000,000 

 to $25,000,000, and in some years iuA^estigators 

 have estimated the loss at double the latter 

 amount. In the Twentieth Annual Report of the 

 Bureau of Animal Industry, the per cent, of loss 

 from disease in the different farm animals is given 

 for the year ending in March, 1904. The per cent, 

 of loss in hogs is about twice that of other ani- 

 mals, due no doubt to epidemic infectious diseases. 



History. — Most writers believe that hog cholera 

 was first introducted into the United States through 



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