PATHOGENIC BACTERIA. 



245 



FIG. 56. 



tion of fluid cultures into the venous circulation of the rabbit 

 generally produces metastatic abscesses in the kidneys, the 

 heart-muscle and the voluntary muscles, and causes death. 



In man this organism produces sup- 

 puration of a localized character, such 

 as we are familiar with in boils and 

 carbuncles. It has been shown to be 

 the usual cause of infectious osteo- 

 myelitis. Osteomyelitis has been pro- 

 duced experimentally in rabbits by the 

 injection of the staphylococcus pyo- 

 genes aureus, both with and without 

 previous injury to the bone of the ani- 

 mal. Ulcerative endocarditis has on 

 numerous occasions been shown to be 

 due to this organism. It has been 

 found possible to produce ulcerative 

 endocarditis experimentally in animals 

 by the injection of the staphylococcus 

 pyogenes aureus when the valves of the 

 heart have first been mechanically in- 

 jured. The staphylococcus pyogenes 

 aureus has also been found in acute 

 abscesses of the lymph-nodes, tonsils, 

 parotid gland, and mammary gland, 



. . , ~r 1 Staphylococcus py- 



m suppurating joint affections and em- ogenes aureus, Geia- 

 pyema. It appears, furthermore, in tin Culture, i Week 

 acute inflammation of the serous mem- 

 branes, pleuritis, pericarditis, peritonitis, although less 

 frequently than the streptococcus pyogenes. 



Staphylococcus pyogenes albus. In form and manner 

 of growth this organism behaves like the staphylococcus 

 pyogenes aureus, with the exception that it produces no 

 colored growths and its cultures appear white. Its patho- 

 genic properties are less marked, and it is a less frequent 



