456 



THE BACTERIOPHAGE AND ITS BEHAVIOR 



since examination of the curves is more instructive than would be an 

 explanation. 



What is the causative bacillus in each of these three cases? It is 

 indeed difficult to make a diagnosis by means of the bacteriophage, 

 which as we have seen, but rarely develops a single virulence. 



Chart 10. Juliette Otj (36 years) Typhoid Fever {B. typhosus) 



!B. typhosus from the patient 

 B. typhosus, stock culture 

 B. coll 



"x" Convalescence 



This virulence extends to other bacteria of the same group to a more 

 or less marked degree, and this fact is particularly in evidence when 

 working with the representatives of the colon-typhoid-paratyphoid- 

 dysentery group. It appears, however, in the case of Louis Pi 



that the causative bacillus must have been the typhoid bacillus, with 



Marie Mo B. paratyphosus A, and in Frangois Jod 



B. paratyphosus B. 



It should be noted that in these three cases in which improvement 



