500 DISEASES OF SWINE 



showing again the protective power of the serum as a preventive 

 measure when injected in a herd that is threatened with cholera. 



Herd Number Forty. — The fortieth herd of this experimental 

 series was located in the southwest quarter of Section 7, Wash- 

 ington Township. The farm, while in another township, was 

 quite close to the farm on which Herd Number 39 was located. 

 Hog-cholera had also been present on this premises for about 

 two weeks at the time the United States officials paid their first 

 visit, which was on the same day as that on which Number 39 

 was treated. Several hogs had already died, and a number of 

 others were sick at this time. One of the sick animals was killed, 

 and a postmortem examination made at this time showed that 

 the findings were those of the slow rather than the acute form of 

 hog-cholera. 



Sixteen shoats in the herd, weighing about 100 pounds each, 

 were injected with a dose of 40 c.c. of serum. These shoats had 

 all been exposed to the sick animals, and many of them were un- 

 doubtedly beginning to come down with the disease at the time 

 of treatment. As no temperatures were reported on these hogs, 

 it is impossible to say just how many of them were really sick on 

 this date. 



Two more shoats that were very sick at the time were injected, 

 one receiving 50 c.c. and the other 60 c.c. of serum alone. Seven 

 shoats, all of which had been exposed, and 2 of which were sick 

 at the time, were left untreated to serve as checks. 



Final report on this case shows that the 2 sick checks and the 

 2 shoats that were sick when treatment was given died. The 

 balance of the herd remained well. 



While the final outcome here was very pleasing for the owner, 

 the results do not give such strong indications of the value of 

 serum as some other herds that have been described. The fact 

 that no more of the checks became sick shows that the outbreak 

 had perhaps about run its course on this farm. There can be but 

 little question, however, that many of the injected shoats would 

 have become sick if left untreated, and several of them would no 

 doubt have later died. Absence of temperature makes it a Uttle 

 hard to draw definite conclusions here. 

 Herd Number Forty-one. — This herd was located in the south- 



