CLINICAL EVIDENCE OF VALUE OF SERUM 465 



abortions have followed the use of the serum or the serum-virus 

 treatment, I think it would be found that in the majority of these 

 cases either rough handUng at the time of treatment was the cause 

 of the abortion, or else that the animals had a high temperature 

 at the time of injection, and that they really had a mild attack of 

 cholera which was checked by the serum. The cause of the abor- 

 tion in this last case was the high temperature caused by the cholera 

 infection, and not due to any action in the body on the part of 

 the serum or the serum and virus when given together. 



Dr. Fitzgerald, of the Ohio State Experiment Station, reports 

 a large number of cases of injection by both the single and double 

 method of pregnant sows, and the number in which an abortion 

 took place was very small, and can be explained in most cases 

 by rough handling or natural causes which frequently cause 

 abortion in the sow. 



As a preventive against the possible occurrence of abortion in 

 sows, it is advisable to manage them in a quiet manner, and by 

 some means which will require the smallest possible amount of 

 handling. The best method of dealing with these pregnant sows 

 is to use a rope with a noose in it and sHp this into the mouth 

 back of the tushes. Then draw up the noose and fasten the rope 

 by taking one or two turns around a convenient post, trees, wagon- 

 wheel, or anything else that is handy. The injection should then 

 be made in the space behind the ears, and the animal loosened by 

 unwrapping the rope from around the post or tree and loosening 

 up the loop in the rope. The sow will quickly shake her head 

 loose from the rope. 



In connection with those pigs which were born of the treated 

 sows it is interesting to note that they do not appear to have had 

 any protection against the disease. As a rule, pigs which are born 

 of an immune sow are born with an immunity or protection 

 against the disease which lasts for several weeks. 



In the case of the sows just mentioned, they evidently were 

 already well along in pregnancy at the time that the injection was 

 given, and the immune bodies had not been sufficiently well 

 developed at the time of farrowing to confer an immunity to the 

 pigs. 



If these same sows were again used for breeding purposes in the 



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