Hog Cholera and Its Prevention-. 141 



house or lot to another even though we know that the latter 

 may have contained hogs that had had cholera and are 

 known to be thoroughly infected with cholera germs. And 

 we have never had an animal become infected by such hand- 

 ling. Further, ve do not fear to introduce new hogs into 

 our herd regardless of where they may come from. Dur- 

 ing the entire show seasons of 1912 and 1913 none of our 

 hogs were troubled with the disease, and after the fairs 

 were over we did not hesitate to return our show animals 

 immediately back into the lots with our other hogs. 



We have carried our tests still farther to prove the ef- 

 ficacy of the simultaneous treatment in producing perma- 

 nent or active immunity. This was done to demonstrate 

 to the breeders and farmers of this locality how cholera 

 epidemics could be prevented. 



In August, 1912, one of our young barrows was placed 

 in a herd of hogs in which an outbreak of cholera had oc- 

 curred. He remained there fifty-five days without contract- 

 ing the disease and then was brought back and placed again 

 among our own hogs. 



The second of January, 1913, we sent out three other 

 barrows to be put among hogs that were dying from 

 cholera. These three barrows remained among those sick 

 hogs for more than six weeks, eating and sleeping with 

 them, but not one of the three became infected or showed 

 any ill effects from the rigid test under which they had been 

 placed. 



Further, at the Live Stock Exposition held in Chicago 

 in 1912 the writer purchased six choice gilts to be shipped 

 us and placed in our breeding herd. Knowing the in- 

 fected condition of the Union Stock Yards, it was 

 stipulated that those gilts should be given the simultane- 

 ous treatment before shipment. Through oversight on the 

 part of the man left in charge of the animals they were 

 not given the treatment, and were shipped immediately 

 after the close of the Exposition and were placed at once 

 among the other animals of our herd which numbered at 

 that time something over 240 hogs and pigs. Only a very 

 few days elapsed after their arrival before those gilts 

 showed distinct evidence of cholera infection. Three of 

 the animals had become so badly infected that it was im- 



