THE COLON-TYPHOID SEKIES 337 



of this organism was brought into question. They proved 

 that the disease could be produced by the injection of blood 

 (from diseased animals) which had been filtered through 

 fine grained porcelain filters. This procedure was known 

 to remove -the larger bacteria such as the "hog cholera 

 bacillus" and demonstrated the disease to be due to one of 

 the so-called filter-passers. Subsequent work showed quite 

 conclusively that Bacterium cholerce-suis is not the cause of 

 hog cholera generally, although it may be an important 

 secondary invader and possibly in young pigs produces a 

 disease somewhat resembling hog cholera. The organism 



FIG. 67. BACTERIA. 1. Bacterium cholerae suis. 2. Bacterium 

 enteritidis. 



can be differentiated from other members of the group only 

 by its physiological and serological reactions. 



BACTERIUM ENTERITIDIS 



Synonym. Bacillus of Gartner. 



This organism has been repeatedly isolated since its dis- 

 covery in 1888 by Gartner in outbreaks of food poisoning, 

 particularly of meat poisoning in Saxony, and likewise from 

 the uncooked flesh of a cow which had been responsible for 

 the infection. It is possible that either this organism OP 

 forms closely related are responsible for many cases of calf 

 diarrhea. Mohler and Buckley have also observed fatal 



