164 



ESSENTIALS OF BACTERIOLOGY 



bers of this group are the Staphylococcus pyogenes, and the 

 Streptococcus pyogenes, so named from the mode of division, 

 the former being found usually in clusters or bunches, the lat- 

 ter in chains. 



Streptococcus Pyogenes (Rosenbach) : Streptococcus 

 Erysipelatis (Fehleiseri). Origin. Fehleisen in 1883 dis- 

 covered this microbe in the lymph- 

 atics of the skin in erysipelas, and 

 he thought it the cause of the same. 

 Under the name Streptococcus 

 pyogenes, Rosenbach described an 

 identical coccus which has been 

 found in nearly all suppurative 

 conditions. 



Fig. 76. Streptococcus 

 pyogenes; culture upon agar- 

 agar two days old (Frankel 

 and Pfeiffer). 



Fig. 77. Streptococcus pyogenes 

 (Jakob). 



Spores 



Form. Small cocci singly and in chain-like groups, 

 have not been found (Fig. 77). 



Properties. They are immotile; do not liquefy gelatin. 



Growth. They grow slowly, usually on the surface, and 

 best at higher temperatures. 



