122 ESSENTIALS OF BACTERIOLOGY. 



Bacillus Coli Communis. (Escherich.) 



Found in human feces, intestinal canal of most animals, in 

 pus and water. 



Form. Short rods with very slow movement, often associated 

 in little masses resembling the typhoid germ, flagellated, does 

 not form spores. 



FIG. 62. 



Bacillus coli communis, from an agar-agar culture; X lu ^0 (Itzerott and Nieinann). 



Properties. Does not liquefy gelatine, causes fermentation in 

 saccharine solutions in the absence of oxygen, produces acid 

 fermentation in milk. 



Growth. On potato a thick, moist, yellow-colored growth. 

 Very soon after inoculation on gelatine a growth similar to 

 typhoid. It can also develop in carbolized gelatine, and with- 

 stands a temperature of 45 C. without its growth being de- 

 stroyed. 



Paihogenesis. Inoculated into rabbits or guinea-pigs, death 

 follows in from one to three days, the symptoms being those of 

 diarrhoea and coma ; after death tumefactions of Peyer's patches 

 and other parts of the intestine ; perforations into peritoneal 

 cavity, the blood containing a large number of germs. 



With the blood of immunized animals a serum reaction 



