416 DISEASES OF SWINE 



counties in the state were entirely freed from hog-cholera. That is 

 to say, the disease was entirely eradicated in these counties by the 

 use of the double method of treatment. Perhaps Dr. Peters is a 

 little overenthusiastic on the results accomplished, but it certainly 

 would appear that when the double method of treatment is limited 

 in its application to men who thoroughly understand their business 

 but very few bad results will be seen, and the good results ob- 

 tained will be very satisfactory. 



Further commenting on the use of the double method of treat- 

 ment in IlUnois, Dr. Peters says: 



"When a man reports bad results from the use of the simultane- 

 ous method and comes back to the laboratory, I can practically 

 always find that the results obtained were due to carelessness. 



"Usually too much hurry, trying to catch a train; forgot the 

 dose. A man has got to take his time and get his doses right, and 

 see that he gets them injected right. If he don't, he is going to get 

 in bad. Too much virus, not enough serum, and the trouble is on." 



(15) In those cases where double method of treatment is given 

 with a poor serum and a disease-producing virus there may be a 

 severe outbreak of cholera follow. In these cases go right back and 

 inject the animals again. Take the temperatures carefully at this 

 time, and to every animal that shows a temperature above 104° F. 

 give a double dose of serum, using a serum at this time that you 

 know is of tested strength. In those animals which have a tem- 

 perature below 104° F. again give the double method of treatment, 

 using a strong virus and a tested serum. 



As an example of what may occur in herds that receive simul- 

 taneous treatment improperly given, the following experience, 

 quoted by Dr. Sihler, of Kansas City, is of interest: 



"There was a herd of 465 shoats, weighing from 50 to 80 pounds. 

 They were given what was presumed to be the simultaneous treat- 

 ment. Just seven weeks after they received that treatment they 

 began to die. I was called upon to make an investigation. I did, 

 and I found that the herd was unquestionably suffering from an 

 outbreak of cholera. I took the temperature of these hogs at that 

 time, and I found that 82 per cent, of them had temperatures rang- 

 mg from 105° F. on up to 108° F. or higher. 



"The entire herd was re-treated. Those that had a high tem- 



