CLINICAL EVIDENCE OF VALUE OF SERUM 503 



injection. This will save nearly every one of the animals, even 

 those that show a high temperature being saved in the majority 

 of cases. 



This outbreak gives again a warning of the danger which is 

 associated with the bringing of hogs from a strange farm and plac- 

 ing them with the home herd. It makes no difference whether 

 they come from a pure-bred farm or not, every new hog brought 

 on the place should be kept separate from the balance of the herd 

 for at least twenty-one, and preferably thirty, days to make sure 

 that he is not suffering from cholera or some other disease which 

 might be transmitted to the balance of the drove. 



The extremely high death-rate in the untreated check pigs of 

 this lot again shows that cholera is very severe and fatal in young 

 animals. The severity of the outbreak among all the animals 

 attacked on this farm would seem to offer further proof that 

 pure-bred hogs are perhaps less resistant to cholera than some of 

 the grade stock. * 



Herd Number Forty-three. — This herd was located in an 

 adjoining farm to Herd 32, and very hkely became infected from 

 the animals of this herd. At the time of the first inspection by the 

 Bureau of Animal Industry veterinarians there were 3 of the 

 shoats sick. The one that appeared the sickest of the 3 was 

 slaughtered, and a postmortem examination made to make posi- 

 tive the diagnosis of cholera. The usual signs of cholera were 

 found, including swollen, discolored lymph-glands, turkey-egg 

 spotted kidneys, spotting of the lungs, and swollen, engorged 

 spleen. 



In handhng this herd 60 c.c. of serum was injected in 4 old sows. 

 Twenty-four gilts, that would average from 100 to 125 pounds in 

 weight each, received 40 c.c. of serum. Eight barrows of the same 

 litters as the gilts received the same size dose of serum. Five pigs 

 of an early fall litter were each injected with 30 c.c. of serum. 

 Fifteen pigs of various sizes and weights were left to serve as 

 checks. 



In this herd, again, the final report gives striking proof of the 

 efficiency of serum as a means of combating hog-cholera even after 

 the disease has made its appearance in the herd. Only 3 of the 41 

 animals that received the serum died. Within a few days after the 



