306 



ANTHRAX; AND HYDROPHOBIA. 



optimum near that of the body. The spores are quite resis- 

 tant to heat, desiccation, and chemicals. 



The growth on culture-medium develops as many small 

 white colonies. In gelatin a stocking-shaped liquefaction like 

 that formed by the Finkler-Prior bacillus occurs (Fig. 137). 

 All the cultures give off a peculiar odor. Much gas is formed. 



FIG. 136. 



Bacillus of symptomatic anthrax, containing spores, from an agar-agar-culture 

 X 1000. (Fraenkel and Pfeiffer.) 



In bouillon the culture sinks to the bottom. Milk remains 

 unchanged. 



Pathogenesis : The organism is pathogenic for cattle and 

 sheep only. No cases of infection in man have been noted. 

 The infection in animals usually occurs through a deep wound 

 of the skin, through which the bacillus gains entrance to 

 the subcutaneous tissues. The organism is also found in the 

 soil, and it is possible that it is ingested by the animal while 

 feeding. 



One attack of the disease confers absolute immunity. Arti- 

 ficial immunity can be produced in small animals, like mice 



