INFECTIOUS DISEASES OF MICE 



387 



or salicin, nor do they ordinarily form indol or liquefy gelatin. 5. typhi- 

 murium is considered to be identical with B. typhi murium, B. aerlrycke, 

 B. pestis-caviae, B. paratyphosus B, Mutton type, and B. enteritidis Breslau 

 of the German literature. Of the several varieties of S. enteritidis, only 

 two are important as mouse pathogens: S. enteritidis Gaertner {B. enteritidis 



Table 2 



Comparison or the Chief Differential Biochemical Reactions and 



Antigenic Components of Organisms Causing Mouse Typhoid or 



Enteritis* 



® = Acid and gas or positive reaction. 



+ = Variable or delayed reaction. 



o = Negative reaction. 



? = Not recorded. 



D = Doubtful, probably negative. 



+ = Acid, no gas. 



** = Occasional strains show delayed fermentation. 



Alk. = Alkaline. 



N = Neutral. 

 * For more detailed information and literature, see Bergey (22) and Topley and Wilson (287). 



Gaertner) and S. enteritidis var. Danysz (47). The two types are identical 

 serologically and differ only in that the Gaertner variety ferments glycerol 

 in Stern's medium. Although frequently confused in the literature, both 

 types are pathogenic for rodents. In Table 2, the chief differential bio- 

 chemical reactions of the organisms discussed in this section are tabulated, 

 together with the antigenic structure of the Salmonella types. 



