400 PATHOGENIC MICROORGANISMS 



stools as a diplococcus or in short chains. Even in the diplococcus 

 form, the individuals may be of different size and shape, some of 

 them oval, rather than round. It may assume diplobacillus-like 

 forms. 



It is Gram-positive, produces neither gas nor indol, and grows 

 well on ordinary broth and agar. It is aerobic, but may grow under 

 anaerobic conditions. 



Its relationship to intestinal disease in children has been sus- 

 pected but never conclusively proven. Mice are susceptible to in- 

 oculation, rabbits and guinea-pigs less so. 



