COMMON DISEASES OF SWINE 299 



Dr. Melvin makes the following statements regarding the 

 experiments : 



" In no cases were any of the ordinary methods of com- 

 bating hog cholera by disinfection and separation of the sick 

 from the apparently healthy practised. Where disease was 

 present at the time of treatment, the treated were allowed to 

 run with the sick animals along with a number of untreated 

 animals, which served as controls, and the success following 

 vaccination can therefore be attributed to the action of the 

 serum. In the herds where hog cholera appeared subsequent 

 to treatment, all of the vaccinated hogs remained well, while 

 more than 65 per cent of the checks (untreated hogs) died. 

 In the herds which had been exposed, but were apparently well 

 at the time of the treatment, 4 per cent of the treated animals 

 died, while approximately 90 per cent of the checks succumbed. 

 In the herds where disease existed at the time of treatment, 

 and where we did not anticipate very great success, 13 per cent 

 of the treated animals were lost, whereas 75 per cent of the 

 checks died. 



" These successful field trials, confirming as they did 

 numerous tests carried out under experimental conditions, have 

 convinced us of the efficiency of this method of dealing with 

 hog cholera, and, though improvements will undoubtedly be 

 made in many of the details of producing the serum, the method 

 is believed to be now in such condition as to make the practical 

 use of it entirely feasible." 



This plan of combating hog cholera must be carried out 

 under the direction of skilled veterinarians, and hence little 

 can be accomplished unless the State comes to the aid of the 

 farmer, supplies the serum at cost, and provides veterinarians 

 to make the injections and to supervise the work. 



Three Methods of Vaccinating. (Kansas Bulletin 182.) 



