CHAPTER VII 



BACTERIA 

 STREPTOCOCCUS PYOGENES 



Streptococcus Pyogenes. 



Streptococcus Erysipelatis. Chain Coccus (Fig. 36). 

 Morphology and Stains. Cocci grow in catenate form of from 

 4 to 40 individuals to a chain. The cocci divide in a single plane, 



FIG. 36. Streptococcus pyogenes. (Kolle and Wassermann.) 



by transverse fission thus giving rise to chains. The cocci are 

 not motile, and do not have spores. They can be stained with 

 all basic stains, and retain the Gram's stain. 



Relation to Oxygen. They grow either in the presence or 

 absence of oxygen, and are, therefore, facultative aerobes. 



Temperature and Food Requirements. 



Develop best at 37C. Will not grow at 47C. Never vege- 

 tate luxuriantly on any culture media, but are most prolific on 



143 



