Swine Growers* Session. 



99 



siderable time in artificial media." This bacillus was found in hogs 

 presenting the common type of the disease, viz. : Congestion and 

 ulceration of the bowels, congestion of lymph glands, enlarged 



« 



spleen, haemorrhagic spots on kidneys, etc. 



Later in the investigations of the Bureau an outbreak of hog 

 cholera was encountered in which the prominent feature was an 

 inflammation of the lungs (a broncho-pneumonia), along with some 

 of the disease changes seen in the usual type of cholera. In the 

 tissues of the affected animals that were examined, the hog cholera 



Inoculating a pig against Hog Cholera, Veterinary Department, Missouri Experiment 



Station, 1907-8. 



bacillus as described above was not found, but a short, oval bac- 

 terium was discovered which does not have the delicate hair-like 

 appendages with which the hog cholera bacillus is provided, and 

 does not have the power of moving about in the fluids in which it 

 grows, and when staining fluids are applied to it, the ends or poles 

 of the bacterium become well stained, while the central portion re- 

 mains unstained. This discovery led to the conclusion that we have 

 in this country two highly infectious diseases of swine instead of 

 one. To the disease which appeared to be caused by the newly 



