WHITE SCOUE OF SUCKLINGS 83 



doses of 40 to 60 c.c, and immunity is sufficiently 

 established within twelve hours to prevent infection 

 and last for about four to five days. Later the vaccine 

 should be used to establish an active immunity. 

 Dose of the attenuated culture vaccine is 2 c.c. Dose 

 of bacterins 2 to 4 c.c, given subcutaneously. 



White Scour of Suckling's. — White scour of newly 

 born animals, especially calves, is an acute con- 

 tagious infectious disease, infecting the animals in 

 the first days of their lives, and is observed usually as a 

 stable infection characterised by profuse diarrhoea 

 and rapid exhaustion. 



Etiology. — The B, coli communis is the organism 

 most commonly attributable for the disease. How- 

 ever, such organisms as the B, aerogenes, paracolon 

 bacilli, also streptococci, B. abortus^ and the B. enteric 

 tidis are stated to be causative agents. A fatal 

 disease of new-born infants, known as '* Wenckel's 

 disease," is also caused by colon bacilli infection. 



The colon bacilli are common inhabitants of the 

 intestines of man and animals, and under ordinary 

 conditions these organisms are quite benign. For 

 some unknown reason, however, their virulence 

 may become exalted, and then in young animals 

 they give rise to serious infections. Once their 

 virulence has been exalted it remains so for several 

 generations. A remarkable fact is the strict speci- 

 ficity of virulence of the colon bacilli species ; this 

 specificity not only applies to species, but to in- 



