Swine Growers' Session. 



105 



pigs received no treatment, but were left to determine whether the 

 disease would spread from inoculated hogs to those not inoculated. 

 Another pig was inoculated with the infected blood, used on the 8 

 head mentioned, to determine whether it was virulent. This pig 

 was put in a pen well isolated from the others, and died November 

 1 from symptoms of cholera, which was confirmed by the post- 

 mortem examination. November 27, one of the "check" pigs that 

 had not been inoculated with serum or virulent blood appeared 

 sick. Two days later, one of the vaccinated pigs of this lot was 

 also sick. The check pig died after a very lingering illness. The 

 vaccinated pig also died at a still later date from an abscess, and 

 there may be doubts as to whether this pig was affected with 

 cholera, although there can scarcely be any doubt in regard to the 

 check pig. The infection probably did not come in this case from 

 the inoculated pigs, but from lot 4, as shall be explained later. All 

 the other pigs of this lot remained perfectly healthy, including one 



Lot. 2. Pigs 1 to 8 "vaccinated;" all remained healthy. Pigs A and B, not vaccinated, died 

 from cholera. All severely exposed to cholera. 



of the check pigs which had not been inoculated. On December 

 10th all the pigs of this pen were exposed to the natural disease, 

 by placing two sick pigs from a natural outbreak of the disease in 

 the pen with these animals. One of these pigs died the 24th and 

 the other on December 28th. A post-mortem examination showed 

 a mixed type of cholera and swine plague. These pigs were under 

 daily observation, and up to January 24th no ill effects were seen 

 from this exposure. On this date, two pigs of this lot were fed 

 viscera obtained from hogs, which had died from a natural infec- 



