CHAPTER V. 



BACTERIA. 



STREPTOCOCCUS PYOGENES. 



Streptococcus Pyogenes. 



Streptococcus Erysipelatis. Chain Coccus. (Fig. 38.) 

 Morphology and Stains. Cocci grow in catenate form of from 

 4 to 40 individuals to a chain. Each coccus comprises two hemi- 



FIG. 38. Streptococcus pyogenes. (Kolle and Wassermann.) 



spheres divided transversely. Some chains appear branched. The 

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

 with all basic stains, and are not decolorized by Gram's method. 



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 37 C. Will not grow at 47 C. Never vegetate 



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