STAPHYLOCOCCUS PYOGENES AUREUS 135 



STAPHYLOCOCCUS PYOGENES AUREUS. 



Staphylococcus Pyogenes Aureus. (Fig. 41.) 



Micrococcus Pyogenes. 



Staphylococcus ^pyogenes aureus, albus, and citreus are known 

 commonly as Staphylococcus, or grape coccus. They differ only 

 in color production on artificial media. 



FIG. 41. Staphylococcus aureus. (Williams.) 



The Micrococcus pyogenes aureus only is here described. 



Morphology and Stains. Round cocci, often growing in 

 bunches like grapes. Individual cocci dividing in two planes. 

 They stain very well with all basic dyes, and are not decolorized by 

 Gram's method. They are not motile; have neither flagella nor 

 spores. 



Oxygen Requirements. The coccus grows well in oxygen, 

 and poorly without it. 



Temperature and Vital Resistance. Thrives best at body 

 temperature, but grows well at room temperature. Resists drying 



