328 



Suppuration 



They can be cultivated at the room temperature, but grow much 

 better at 30° to 37°C. They are not particularly sensitive to the 

 presence or absence of oxygen, but perhaps develop a little more 

 rapidly in its presence. The cultural appearances are identical 

 with those of Streptococcus pyogenes. 



When injected into animals Fehleisen's coccus behaves exactly 

 hke Streptococcus pyogenes. 



Micrococcus Tetragenus (Gaffky) 



General Characteristics. — Large, round, encapsulated cocci, regularly asso- 

 ciated in groups of four, forming tetrads. They are non-motile, non-flagellated, 

 non-sporogenous, non-liquefying, non-chromogenic, non-aerogenic, aerobic and 

 optionally aerobic, pathogenic for mice and other small animals, and stain well 

 by all methods, including that of Gram. 



A large micrococcus surrounded by a broad capsule, grouped in 

 fours and hence known as Micrococcus tetragenus can sometimes 



Fig. 108. — Micrococcus tetragenus in spleen of infected mouse. (From Hiss 

 and Zinsser, "Text-Book of Bacteriology," D. Appleton & Co., Publishers.) 



be found in normal saHva, tuberculous sputum, and more commonly 

 in the contents of the cavities of tuberculosis pulmonaUs. It 

 sometimes occurs in the pus of acute abscesses, and may be of im- 

 portance in connection with the pulmonary abscesses which compli- 

 cate tuberculosis. It was discovered by Gaffky.* 

 Morphology. — The coCci are rather large, measuring about i m 

 * "Archiv. f. Chirurgie," xxviii, 3. 



