Essentials of bacteriology; being a concise and systematic introduction to the study of bacteria and allied microörganisms . altar. In Malta,among the troops, the fever has been greatly reduced byeliminating mUk from the dietary. CHAPTER XXm PYOGENIC COCCI Nearly all micro-organisms can produce suppuration, butin the acute abscesses occurring in the skin and lymphatics andaccompanying all pus affections are foimd groups of micro-cocci so regularly that they have been designated as the pus-forming or pyogenic cocci. The two most important mem- 164 ESSENTIALS OF BACTERIOLOGY bers of this group
Essentials of bacteriology; being a concise and systematic introduction to the study of bacteria and allied microörganisms . altar. In Malta,among the troops, the fever has been greatly reduced byeliminating mUk from the dietary. CHAPTER XXm PYOGENIC COCCI Nearly all micro-organisms can produce suppuration, butin the acute abscesses occurring in the skin and lymphatics andaccompanying all pus affections are foimd groups of micro-cocci so regularly that they have been designated as the pus-forming or pyogenic cocci. The two most important mem- 164 ESSENTIALS OF BACTERIOLOGY bers of this group are the Staphylococcus pyogenes, and theStreptococcus 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): StreptococcusErysipelatis (Fehleisen).—Origin.—Fehleisen in 1883 dis-covered this microbe in the lymph-atics of the skin in erysipelas, andhe thought it the cause of the the name Streptococcuspyogenes, Rosenbach described anidentical coccus which has beenfound in nearly all Fig. 76.—Streptococcuspyogenes; culture upon agar-agar two days old (Frankeland Pfeiffer). Fig. 77.—Streptococcus pyogenes(Jakob). Form.—Small cocci singly and in chain-like groups. Sporeshave not been found (Fig. 77). Properties.—They are immotile; do not Hquefy gelatin. Growth.—They grow slowly, usually on the surface, andbest at higher temperatures. PYOGENIC COCCI 165 Colonies.—In three days a very small grayish speck, whichhardly ever becomes much larger than a pin-head; undermicroscope, looking yellowish, finely granular, the edges welldeiined. Stab-cultures.—^Along the needle-track little separated col-onies, like strings of beads, which after a time become onesolid white string. Stroke-culture on Agar.—^Little drops, never coalescing,having a bluish tint, very transparent. Potato.—No apparent growth. Bouillon.—^At 37° C. clouds are
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