498 DISEASES OF SWINE 



break of hog-cholera in the check shoats kept in the same pen with 

 them, those treated hogs remained well, and not even one of them 

 was found to be off feed at any time. The outbreak in the checks 

 did not occur until over a month after treatment was given. This 

 serves to show that the protection given by the simultaneous 

 method lasts for a long period, and is not merely a temporary one, 

 as in the case of the single treatment. Had these shoats been given 

 the serum-alone method it is quite likely that the protection would 

 have run out in several of them by this time, and the disease would 

 have in this event made its appearance in the treated as well as the 

 untreated portion of the herd. 



Any further proof that might be lacking as to the efficiency 

 of the simultaneous injection in this case is given by the after- 

 results, when hogs from this farm were purchased at public sale 

 and taken to other infected feed lots and put in pens where hogs 

 had recently died with cholera, and in some cases, no doubt, 

 with animals that were at the time suffering from the disease. 

 In not one of these cases did the treatment prove ineffective! 

 Not one of the hogs so exposed took the disease! This, even though 

 over two months had elapsed since the injections were made. 

 More convincing proof could hardly be offered than that shown in 

 this case. The simultaneous treatment produced absolutely no 

 ill effects in this herd, and it conferred upon the treated shoats a 

 complete and permanent protection against the germs of hog- 

 cholera. 



Equally good results can and will be obtained in other herds 

 when a pure virus and a tested serum are used. The underlying 

 basis of the treatment is sound. Its principles have been repeat- 

 edly proved, and it only remains to make sure that the materials 

 used are correct. Beneficial results are bound to follow if these 

 precautions are taken. 



Herd Number Thirty-Nine. — The farm on which this test 

 herd was located was in the northeast quarter of Section 12, 

 Jackson Township. The animals were first seen on November 13, 

 1907, and at this time 2 old sows and several shoats were quite 

 sick. One of the sick shoats was killed and opened up for the 

 purpose of making a positive diagnosis. The findings were those 

 of hog-cholera, but were not as marked as those often seen in a 



