— 
The results of 4he entire series of experiments as far as the 
acquisition of immunity on the part of the laboratory animals is 
concerned are summarized in Table XVI. 
TABLE XVI 
No. rabbits 
treated 
and immunity 
tested 
No. of 
bacterin 
or vaccine 
injections 
Results 
Remarks 
Rabbits 
dead 
Rabbits 
alive 
59 
1 
56 
3 i 
47 
2 
47 
0 
Only those rabbits which 
48 
3 
48 
0 
lived long enough to receive 
20 . . 
4 
20 
0 
the final virus dose were 
3 
8 
3 
0 
considered in the construc- 
10 
12 
10 
0 
tion of this table. 
187 
• • 
184 
3 
CONCLUSIONS 
It does not appear that the vaccines and bacterins experi- 
mented with have any antigenic value which expresses itself in 
actual resistance to B. bipolaris infection. We encountered uni- 
form negative results, no matter if we injected those substances 
once or a dozen times; a virus injection was always certain to 
kill the animals. 
The indications are that if hemorrhagic septicemia is in 
reality a frequent and very fatal disease to our farm animals, 
that the commercial immunizing agents against it are indeed a 
poor staff to lean on and that if those diseases are at all to be 
combatted in a serious manner, we will have to look to other 
methods for relief. 
(5M) 
