WHITE SCOUE OF SUCKLINGS 85 



administration of the mixed bacterin. Dose of the 

 bacterin is 2 c.c. 



Remembering the strict specificity of the various 

 strains of the colon bacillus, it is very hard to believe 

 that good results can follow from the use of stock 

 vaccines or serum ; however, as such strict specificity 

 does not apply to the other organisms regarded as 

 accountable for white scour, the good results 

 recorded from the use of stock vaccines and serum 

 may be referred to the immune bodies provoked 

 against these latter organisms. A method of pro- 

 phylaxis against white scour I have personally adopted 

 with very good results is as follows : From an 

 animal which has died of the disease I have an auto- 

 genous vaccine prepared; the bacteria chiefly found 

 are the colon bacillus and, in some cases, the paracolon 

 bacillus. I presume that it is this particular strain 

 of organism which is virulent on the particular 

 premises where the infection occurs. This vaccine 

 is used to vaccinate the pregnant cows on the 

 premises. The vaccination should be carried out 

 during the seventh and eighth months of pregnancy, 

 as if left till later the cow may abort. Three injec- 

 tions of the vaccine are made at intervals of ten days. 

 The first injection contains 10 million dead bacteria, 

 second injection 25 million, and third injection 50 

 million. My idea is to actively immunise the mother 

 against the particular strain of organism responsible 

 for the disease, and thereby transmit the protective 

 bodies to the foetus by way of the maternal circula- 

 tion. By this method I have completely eradicated 



