SCHIZOPHYTA SCHIZOMYCETES 177 



Pathogenesis. The organism, probably an avirulent type, is found in normal 

 saliva. Under some conditions, either alone or with other organisms, produces 

 pneumonia or metastatic endocarditis, otitis media, and tonsillitis. 



Poisonous properties. 



Immunity. Xot permanent, probably opsonic in nature. 



Bacterium cholerae, Kitt 



Disease produced. Chicken cholera, and rabbit septicemia. 



Animals infected. Chicken, pigeon, goose, duck, rabbit, and mouse. 



Pathogenesis. Generalized septicemia with minute hemorrhages, peritoni- 

 tis, or the formation of diptheritic areas. 



Poisonous properties. Not known. 



Immunity. Agglutinins well developed and immunization with killed or 

 attenuated cultures induces the formation of bacterolysins and probably opsonins. 

 In cultural and pathogenic character, this organism is closely related to the 

 four following, all being classed under the general group of organisms produc- 

 ing diseases known as pasteurellosis. 



Bacterium suicida, Migula 



Animals infected. Hog. 



Animals susceptible. Rabbit, guinea pig, and less so chicken and pigeon. 

 See preceding. 



Bacterium sanyiiinarium, Moore 



Disease produced. Infectious leukemia. 

 Animals infected. Chicken. See preceding. 



Bacterium bovisepticum, Kruse 



Disease produced. Hemorrhagic septicemia. 

 Animals infected. Cattle. See preceding. 



Bacterium ai'iiim, Moore 



Disease produced. Roup. 

 Animals infected. Chicken. 



Bacterium astheneae, Dawson 



Disease produced. Asthenia or going light. 



Animals infected. Chicken. 



Animals susceptible. Guinea pigs, and rabbits. 



Pathogenesis. ? 



Poisonous properties. Xot known. 



Immunity ? 



Bacterium anthracis, Migula 



Disease produced. Anthrax or splenic fever. 

 Animals infected. Mouse, guinea pig, rabbit, sheep, cattle, man. 

 Animals immune. Carnivora. 



Pathogenesis. Oedema at point of inoculation, spleen very much enlarged, 

 pulpy, internal organs generally hyperaemic. The organism is to be found in 





