BACILLUS FELIS SEPTICUS 187 



BACILLUS FELIS SEPTICUS. 



This bacillus was isolated regularly by Fiocca from the saliva of 

 cats. 



Microscopical Appearances. Very small short rods, 0-2 to 0-3 //, 

 thick, often occurring as diplococci. 



Spore Formation absent. 



Staining Reactions. By ordinary methods, but not by the 

 Gram method. 



Biological Characters. Its growth is similar to the rabbit 

 septicaemia bacillus. 



In Bouillon it forms no flakes. 



Milk is not coagulated. 



On Potatoes a very thin, almost invisible coating. 



Sugar Media is not fermented. 



Pathogenesis. Produces septicaemia in mice, rabbits, guinea-pigs, 

 and young rats. 



BACILLUS TYPHI MURIUM. 



(Mouse Typhoid.) 



This bacillus was discovered by Loffler in an epidemic among 

 mice. 



Microscopical Appearances. Small rods, which often form long 

 threads. 



Motility. Strongly motile. 



Staining Reactions. Easily stained with the ordinary stain, but 

 not by the Gram method. 



Biological Characters. On Gelatine Plates the deep colonies are 

 small, round, slight, granular, and of yellowish-brown colour ; the super- 

 ficial colonies are flattened, irregularly notched, and possess delicate 

 furrows similar to the colonies of the typhoid bacillus, only more granu- 

 lar and of more luxuriant growth. 



In Stab Cultures. Nail-like growth with a flat top. 



On Agar, Blood Serum, and Bouillon the growth exhibits no special 

 characteristics. 



On Potatoes a whitish, not specially luxuriant coating forms, the 

 surrounding medium being stained a dirty greyish-blue. 



