HOG CHOLERA 285 



erties as the serum of the hyper-immunized hog. While 

 this work has been more or less successful, it has not as 

 yet been carried far enough to have any very definite 

 results. It can easily be seen that if the blood serum of 

 a horse could be used, it could be made much more 

 cheaply because the horse will produce a very much 

 greater quantity of blood serum. In the case of hogs, 

 individuals from which the blood is drawn, after being 

 hyper-immunized, are not necessarily a loss because the 

 carcasses of such; hogs can be used for pork. 



SYMPTOMS OF THE DISEASE. 



The symptoms of ho cholera given briefly are as fol- 

 lows-: Pigs having the disease will present the general 

 appearance of sickness and may have a short hacking 

 cough. They lose spirit and activity, the ears and tail 

 droop, the coat becomes rough and the pigs lose their 

 appetite, become weak and are disinclined to move about. 

 They may at first be constipated and then develop 

 diarrhea, passing dark and very offensive feces. In very 

 acute cases the pigs may even die before sickness is no- 

 ticed. The skin at the more tender parts may be red and 

 inflamed. Other ailments may also produce these same 

 symptoms except the feces. 



On post-mortem examination yellow and tlack ulcers 

 may be found in the wall of the intestine. In acute cases 

 these may not be found and the internal organs and body 

 fluid may be red, or the intestines and other internal 

 organs may be dotted with small red spots, and some- 

 times only a few red pin-points are found on the kidneys 

 and it may even be necessary to remove the outer mem- 

 brane to see these. 



