HANDLING HOG CHOLERA IN THE FIELD 161 



cholera; diagnosis, when and whether to vacci- 

 nate, the method to use, and the subsequent han- 

 dling of the herd all enter into the problem. 



Handling .the cholera infected herd. Let us 

 assume, as a working basis, that a herd consisting 

 originally of one hundred ordinary shoats, in good 

 condition, is infected with hog cholera; ten have 

 died, ten are visibly sick, and there is no evidence 

 of secondary infection; there are no other hogs 

 on the farm, and the shoats are in a pasture con- 

 taining several acres; the owner has had hog 

 cholera in his herd in previous years, and knows 

 the results that may reasonably be expected from 

 preventive measures. This represents the sim- 

 plest situation we are called on to cope with in 

 handling hog cholera in the field. 



Three methods of handling are open to us : 



1. Give generous doses of serum alone to all 

 animals that are not exceedingly weak. 



2. Give simultaneous treatment to all seemingly 

 well animals, and double doses of serum alone to 

 those that are visibly sick, and not obviously near 

 death. 



3. Give serum alone in full doses to all ani- 

 mals that are apparently well, in double doses to 

 those that are sick and have a chance to recover, 

 and follow this in three weeks with simultaneous 

 treatment for all animals that were not visibly 

 sick at the time of the first treatment. In other 



