464 Spirillum of Denecke 



It seems unlikely, from the evidence thus far collected, 

 that the Finkler and Prior spirillum is pathogenic for the 

 human species. As Frankel points out, it is probably a 

 frequent and harmless inhabitant of the human intestine. 



THE SPIRILLUM OF DENECKE (VIBRIO TYROGENUM). 



Another organism with a partial resemblance to the 

 cholera spirillum was found by Denecke * in old cheese. 



Morphology. Its form is similar to that of the cholera 

 spirillum, the shorter individuals being of equal diameter 

 throughout. The spiral forms are longer than those of the 



Fig. 137. Spirillum of Denecke, from an agar-agar culture. X 1000 

 (Itzerott and Niemann). 



Kinkier and Prior spirillum, and are more tightly coiled than 

 those of the cholera spirillum. 



Like its related species, this micro-organism is actively 

 motile and possesses a terminal flagellum. 



Cultivation. It grows at the room temperature, as well 

 as at 37 C., in this respect, as in its reaction to stains, much 

 resembling the other two. 



Colonies. Upon gelatin plates the growth of the colonies 



is much more rapid than that of the cholera spirillum, 



though slower than that of the Finkler and Prior spirillum. 



The colonies appear as small whitish, round points, which 



*" Deutsche med. Wochenschrift," 1885. 



