STAPHYLOCOCCUS PYOGENES AUREUS. 



staphylococcus pyogenes citreus, staphylococcus cereus albus^ 

 staphylococcus cereus flavus, bacillus pyogenes fatidus (Passet), 

 bacillus colt communis^ bacillus pyocyaneus, micrococcus tetra- 

 genus, pneiimococcus, pneumobacilliiS) and others. 



In secondary suppurations following acute specific dis- 

 eases the corresponding organisms have been found in 

 some cases, such as gonococcus, pneumococcus of Fraenkel, 

 pneumobacillus of Friedlander, and the typhoid bacillus. 



Suppuration is also produced by the actinomyces and the 

 glanders bacillus, and sometimes chronic tubercular lesions 

 have a suppurative character. 



Staphylococcus Pyogenes Aureus. Microscopical Char- 

 acters. This organism is a spherical coccus about .9 //, in 

 diameter, which grows 

 irregularly in clusters 

 or masses (Fig. 40). 

 It stains readily with 

 all the basic aniline 

 dyes, and retains the 

 colour in Gram's 

 method. 



Cultivation. It 

 grows readily in all 

 the ordinary media, 

 growth taking place at 

 the room temperature, 

 though it is much 



more rapid at the FIG. 40. Staphylococcus pyogenes aureus, 

 temperature of the young culture on agar, showing clumps of 



body. In stab cul- 



J 

 tures on peptone gela- 



tine a streak of growth is visible on the day after inocu- 

 lation, and on the second or third day liquefaction 

 commences at the top. As liquefaction proceeds, the 

 growth falls to the bottom as a flocculent deposit, 

 which soon assumes a bright-yellow colour, while a yellowish 

 film may form on the surface, the fluid portion, however, 

 remaining turbid. Ultimately the gelatine becomes liquefied 



Stained with weak carbol-fuchsm. x 1000. 



