388 DISEASES OF SWINE 



destroying bodies in the serum will attack the disease germs in 

 the animal and destroy them. It is desirable to inject enough of 

 the virus to give a good stimulation to the cells, and in this manner 

 start up a free manufacture of these same germ-destroying bodies 

 to which the animal will owe its power to keep free from cholera 

 for the balance of its life. 



As in the case of the dose of serum, the dose of the virus blood 

 will vary somewhat with the age and weight of the animal. The 

 following figures are about the dose in which the virus is given 

 by the leading serum men of the United States: 



10- to 25-pound pigs I 



25- to 50-pound pigs § 



50- to 75-pound shoats f 



75- to 100-pound shoats f 



100- to r25-pound shoats 1 



125- to 150-pound shoats 1 



150- to 200-pound hogs IJ 



200- to 250-pound hogs U 



All hogs over 250 pounds I5 to 2 



Dangers of Double Treatment. — This is a question which is 

 very commonly met with in the use of the simultaneous method of 

 treatment. Is there any danger in the use of this double method of 

 treatment? This question is often asked, as farmers have in some 

 instances found that the use of this method of treatment has been 

 followed within about five days by a very severe outbreak of chol- 

 era in their feed lots, with a complete wiping out of the entire 

 herd within a week or ten days. 



If this were to occur after the use of the simultaneous method 

 it would surely be a most undesirable outcome, and one which 

 would reflect very disastrously upon the veterinarian or others 

 who had given the serum. 



I have investigated a number of these reported bad results 

 following the use of the double method of treatment, and in almost 

 every case I have found, when the matter is traced to the bottom, 

 the real cause of trouble has been either that the treatment was 

 not properly administered or the serum used was of a questionable 

 character. 



