CONTROL AND ERADICATION OP HOG CHOLERA 239 



with virus was much more readily prevented than 

 were the disasters growing out of the use of good 

 serum by untrained or indifferent men, and to- 

 day it is to the latter abuse that most outbreaks 

 of hog cholera which originate from laboratory 

 virus must be attributed. 



The task of reducing "vaccination cholera" to 

 a minimum must be referred to a trained and 

 awakened veterinary profession. There is an in- 

 sistent demand that vaccination of hogs shall be 

 placed in the hands of laymen, a policy which, if 

 adopted generally, will be disastrous to the swine 

 industry. Yet this demand will be heard and 

 heeded as long as there is territory in which 

 there are not qualified veterinarians to do the 

 work. 



Eeducing the problem of hog cholera control to 

 its simplest terms it may be said that in the indi- 

 vidual animal the disease soon terminates, for the 

 virus will destroy or immunize its host in a few 

 weeks. Likewise in the herd the same principle 

 applies, but if we expand our unit to include 

 county, state or nation the difficulties that present 

 themselves multiply accordingly. The limiting 

 factors in the control of the disease are lack of 

 thoroughly trained men, lack of understanding on 

 the part of the public, and the expense involved. 



The federal Bureau of Animal Industry has 



