CLINICAL EVIDENCE OF VALUE OF SERUM 461 



This fact is also of importance in case we are about to ship 

 animals away for exhibition at stock shows or fairs. It very 

 frequently happens that the pens at these fairs become infected 

 with cholera virus, or an outbreak of cholera may occur in the 

 animals which are being shown in the very next pen to your own. 

 In this case if your animals are unprotected you are almost sure 

 to suffer a severe loss from the outbreak of the disease in these 

 high-priced animals. The worst feature of this matter is the fact 

 that your animals may not get sick until after you have taken them 

 home and placed them back in the feed lots. In this case you not 

 only are likely to lose the show animals, but the disease will 

 spread to other hogs in the herd, and a loss of several thousand 

 dollars is not unusual in thoroughbred herds following an out- 

 break brought in in this manner. 



This danger can be entirely avoided if the animals which are 

 to be used for show purposes are first given the simultaneous 

 method of treatment. In this way they are absolutely protected 

 against the virus of cholera, and no amount of exposure in infected 

 pens or by coming in contact with sick hogs will cause them to get 

 sick. 



In the case of the outbreak at the home place, which occurred 

 after the removal of part of the animals to the infected farm, there 

 are also a number of very valuable points of interest. The most 

 likely manner in which the disease reached this herd has already 

 been pointed out. The infection was no doubt carried back to the 

 farm at the time when the 14 experiment animals were moved 

 to the farm of the neighbor where hog-cholera already existed. 



In the outbreak at the home farm it is particularly worthy of 

 note that the younger shoats and the sucking pigs were among 

 the first to show the disease, and also that they were the most 

 severe sufferers from the outbreak. This only serves to bear out 

 the statements that have been previously made in this work, to 

 the effect that hog-cholera is especially likely to break out where 

 sucking pigs or young shoats are exposed to infection. 



Very good examples of this are to be found in cases where a 

 herd of hogs is kept in a pasture along a pubUc roadway. The 

 young pigs will almost always find a hole in the fence through 

 which they can crawl and get out into the road. It is very common 



