236 HOG CHOLERA 



even slight lesions suggestive of cholera will yield 

 carcasses that contain virus, almost without ex- 

 ception. 



The third object sought should be that of neu- 

 tralizing the effects of virus-carrying carcasses 

 that pass inspection. To this end it should be 

 made known among swine raisers that danger al- 

 ways lurks in the practice of feeding even small 

 quantities of garbage that contain pork trim- 

 mings. A system of licensing garbage-feeding 

 such as the one that now exists in Canada, is also 

 worthy of consideration. 



Transportation and sale of susceptible feeder 

 hogs and those which receive simultaneous treat- 

 ment just before shipping. Most public stock- 

 yards are contaminated with hog cholera virus, 

 and eventually it should be so ordered that when 

 susceptible hogs enter, it shall be for immediate 

 slaughter only, and the gates shall close behind 

 them forever. Previously we have drawn atten- 

 tion to the fact that " serum breaks " are fre- 

 quently a result of giving hogs simultaneous treat- 

 ment and shipping them immediately afterward. 



Though this practice is probably the lesser evil 

 as compared to shipping susceptible hogs from the 

 yards without immunization, the fact remains that 

 it is still a potent factor in the dissemination of 

 hog cholera virus. Follow-up treatment as a sub- 

 stitute for simultaneous treatment given immedi- 



