458 DISEASES OF SWINE 



type to be found on the average farm, and consisted of old sows, 

 large spring shoats, small shoats, and sucking pigs. 



Forty-four shoats, averaging about 125 pounds, were injected 

 with the simultaneous treatment. Each animal received 30 c.c. 

 of serum and at the same time was injected with 2 c.c. of virus 

 blood. Six shoats, weighing 80 pounds each, were injected with 

 20 c.c. of serum and 2 c.c. of virus blood. Two boars, weighing 

 about 150 pounds each, received 40 c.c. of the same serum and 2 c.c. 

 of virus blood. Four pigs, weighing about 30 pounds each, were 

 injected by the single method, each pig receiving 10 c.c. of serum 

 without any virus blood. Ten small sucking pigs were also treated 

 by the single method, receiving 10 c.c. each of serum. Nineteen old 

 hogs were injected by the double method, each one receiving 40 c.c. 

 of the serum plus 2 c.c. of virulent blood. 



One old sow, 12 shoats of various sizes, and a few of the sucking 

 pigs were left untreated, to be used as checks. 



This entire herd remained well for a considerable length of time 

 after the treatment was given, infection apparently not being car- 

 ried to the farm. In accordance with arrangements previously 

 made with the owner of the herd, 3 of the untreated checks and 

 11 of the larger treated shoats were moved to the farm of a neighbor 

 where cholera had been present. These hogs were placed in the 

 same feed lots where the disease had been present and where other 

 hogs had died. There were some shoats in the feed lot at the time 

 which were sick with cholera. 



Within a few days the 3 untreated checks took the disease and 

 2 of them died. The third one finally recovered. 



The 11 treated shoats remained perfectly well, with the excep- 

 tion of one, which was found dead in the feed lot the day after they 

 were placed there. The cause of death in the case of this animal 

 was never determined, as it was impossible to return at that time 

 and open up the body. It is almost certain, however, that the 

 cause of death was not cholera, as the animal appeared to be in per- 

 fect health the night before, and cholera would not develop and 

 cause death that rapidly even in an untreated animal. It is more 

 likely that the animal was killed by fighting with the strange hogs 

 with which it came in contact in this new feed lot. 



Within a short time after the 14 hogs had been moved from the 



