MY EXPERIENCE WITH ANTI-HOG CHOLERA SERUM.* 
By Dr. E. E. Black, Colfax, Iowa. 
In the beginning I will say that I consider the serum to be of 
great benefit to growers of swine, but that its use among the 
farmers where no two herds are kept under the same circum¬ 
stances of conditions will not give as successful results as the 
tests that are being conducted by private firms as well as by the 
government. 
I began vaccinating about the first of July and am still using 
the serum, although not as much as earlier. I vaccinated three 
herds in one immediate neighborhood where the cholera was the 
strongest before any of the three showed infection. These three 
men have undergone the outbreak without one sick animal, while 
their closest neighbors have all had the disease in their hogs. This 
would go to show that without a question of doubt that the serum 
is absolutely prophylactic. Many other herds were vaccinated 
while still healthy and still remain so, but I cited the three above 
especially on account of their being in the thickest of the out¬ 
break. 
My results where the infection already existed have as a 
whole been very favorable. I will relate only a few typical cases. 
In one drove of sixty shoats and twenty sows I was called after 
four or five had died, and perhaps eight or nine showed symptoms 
of cholera. All the live ones were vaccinated and since only 
about fourteen have died, including the nine sick ones, and per¬ 
haps the other five had the fever when vaccinated. I have not 
made a practice of taking temperatures before vaccination, al¬ 
though no doubt it is best if time is not too valuable. 
Another drove was vaccinated immediately upon the discovery 
of one sick shoat, which died on the morning of vaccination, and 
not another case of cholera developed. There was no doubt but 
* Presented to the Iowa Veterinary Association, Cedar Rapids, November, 1911. 
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