100 THE PATHOGENIC BACTERIA. 



cultures of these organisms have been found in some cases 

 of abscesses during the respective infections. 



Nearly all pyogenic organisms are facultative anaerobics. 



THE INDIVIDUAL FEATURES OF THE PYOGENIC 

 BACTERIA. 



I. Staphylococcus Pyogenes Aureus. 



The Staphylococcus pyogenes aureus, by far the most fre- 

 quent pus organism, is found a. in health on the surface of the 

 skin, also of the mucous membranes in the digestive tube, 

 and upper part of the respiratory tract, and b. in pathological 

 conditions in pus irrespective of its localization, either alone 

 or in association with the other pyogenic staphylococci, also 



FIG. 47. 



Preparation from pus, showing pus-cells, A, and staphylococci, C. (Abbott.) 



in the blood in cases of general infection, and a number 

 of cases of extensive suppurating lesions, abscesses, suppu- 

 rating tumors, furuncles, etc.; and c. outside of the human 

 body in the air, in dust, and occasionally in water. 



Morphology. The Staphylococcus pyogenes aureus is a 

 small , rounded, celL. having a diameter of 0.9 to 1.2 mikrons, 

 found "either', singly ;c"r^;in fee^lar, groups or masses resem- 

 bling a bunch of 1 grapes, hence its name. Sometimes it is seen 



