NINTH ANNUAL YEAR BOOK— PART IX 
369 
The method of immunization as a preventative measure, under the 
Von Behring method, is now being tried quite extensively in different 
parts of the world, and many encouraging reports are being made, and it 
is to be hoped that this immunizing agent will prove successful. 
Another method of eradicating tuberculosis, and known as the Bang 
method, is to test all the animals in a herd, and isolate as completely as 
possible those reacting from those that do not, and which show no physi- 
cal signs of the disease, and also isolating the calves from reacting cows 
and feeding them upon milk of healthy cows. This method, where tried, 
has been voluntary on the part of the owners. However, it has not been 
entirely satisfactory, mostly on account of the expense of keeping sepa- 
rate diseased animals from those healthy; also the ever-present risk of 
infection to the healthy animals. 
Through the efforts of this department the enactment of a law making 
compulsory the pasteurization of skimmed milk has been one effective 
means of preventing the spread of tuberculosis among patrons of Iowa 
creameries. 
As an example of the direct results accomplished in our department, 
the following report is cited: One of the assistants tested forty-three 
Short Horn and Jersey cattle. Of this number forty reacted — about 93 
per cent. Acting upon this finding fourteen of the infected animals were 
immediately slaughtered at a packing house. Upon post mortem exami- 
nation all revealed tubercular lesions, three were condemned and the 
others were placed in quarantine. The owner of this herd expects to 
have the remaining twenty-seven slaughtered soon, and he will also use 
the Bovo-vaccine method as a future preventative. One specific fact in 
connection with this case, and one upon which particular stress is laid, 
is that the owner and breeder of this stock suffered the amputation of 
one of his limbs because it was affected with tuberculosis. It would, 
therefore, be of interest to know exactly the source of inoculation; 
whether the method of transmission was through the owner of the stock 
or the reverse. 
POST MORTEM TEST SHEET NO. 1. 
t-l 
Glands 
a 
Glands 
> 
2 
d 
ft 
Disposition 
B 
1 
1 
si 
o 
d 
o 
1 
o 
a 
O 
"3 
o 
1 
2 
3 
4 
5 
6 
7 
8 
9 
10 
11 
12 
13 
14 
- 
- 
- 
- 
- 
- 
- 
p 
p 
p 
p 
p 
p 
p 
p 
p 
p 
p 
+ 
24 
