GENERAL SUMMARY OF USE OF SERUM 419 



If these same animals are already infected by the hog-cholera 

 virus, the effects from the injection of the sermn alone will be the 

 same as from the injection of the double dose in an animal which 

 has never had the disease, the only danger being that, where the 

 animal already has the disease, there is danger that the cells of the 

 body have already been so weakened as to make it impossible to 

 save the life of the animal even with the injection of serum. 



As small pigs are not capable of developing a permanent im- 

 munity, it is well to give them the serum alone, and six weeks later 

 inject them with the double method of treatment. 



(17) The double method of treatment should be used in all ani- 

 mals that have been exposed to the disease and have not yet 

 developed any symptoms of cholera, as shown by absence of a 

 fever temperature and absence of any other signs of cholera, such 

 as loss of appetite, weakness, staggering gait, or cough. 



Where cholera occurs on one farm, the animals of the adjoin- 

 ing farms should receive the double method of treatment. 



Animals that are about to be turned into a feed lot where hog- 

 cholera has recently been present, or where there are at the time 

 animals sick with cholera, should be injected by the double method 

 of treatment. Some would advise rather that the serum alone be 

 given, and the animal allowed to take up the germs in the usual 

 way from the feed lot, but the double injection is much more cer- 

 tain and makes sure of a permanent immunity. 



(18) By using hogs for breeding purposes that have been treated 

 with the double method, and then giving the pigs a double treat- 

 ment at the time they begin to take other articles of food as well 

 as the mother's milk, it will be possible to keep every hog on the 

 premises free from cholera, and the disease will die out for want 

 of unprotected animals to attack. The hog-cholera virus cannot 

 live long unless it has something to live upon in the shape of live 

 hog bodies or the bodies of those that have been buried. 



Serum and Swine Plague. — The question may be frequently 

 met with. What effect will the use of hog-cholera serum have upon 

 animals suffering with swine plague? Will the use of the serum 

 have any effect as a curative in this disease? Will the use of the 

 double method of treatment prevent animals developing swine 

 plague? 



