SPIRILLUM RUBRUM 629 



Potato. — 7 days at 28° C. Poor growth of discrete or partly confluent red colonies. 



Horse Blood Agar Plate. — 2 days at 28° C. Very small, low convex colonies ; no haemo- 

 lysis. 



Resistance. — Not specially resistant. Dried on silk threads, the organisms do not survive 

 longer than 6 to 8 days. 



Metabolism. Aerobic ; grows very poorly under anaerobic conditions. Optimum tem- 

 perature 25-30° C. often little growth at 37° C. Grows very poorly in peptone 

 water. No hsemolysin formed. Red pigment formed, best under a low oxygen 

 pressure. 



Biochemical — No sugars fermented. L.M. unchanged. Indole — . Cholera-red reac- 

 tion—. M.R. — . V.P. — . Nitrates not reduced. NHj-j-. HjS— . Catalase-(-. 

 M.B. reduction — •. 



Pathogenicity. — Non-pathogenic to man or animals. 



Other members of this group that have been described are Spirillum undula, 

 Spirillum serpens, Spirillum volutans, and Spirillum minus (see p. 1838). 



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