STAPHYLOCOCCUS PYOGENES AUREUS 323 



Although exhibiting marked Brownian movements in the hanging 

 drop, staphylococci are non-motile and possess no flagella. They are 

 non-sporogenous and form no capsules. 



Cultural Characters. — Staphylococci grow readily upon the usual 

 laboratory media. The simpler media, made of meat extract, are quite 

 as efficient for their cultivation as are the freshly made meat-infusion 



Fig. 70. — Staphylococcus Colonies 



products. The optimum temperature for staphylococcus cultivation 

 lies at or about 30° C, though growth readily takes place at tempera- 

 tures as low as 15° C, and as high as 40° C. Slow but definite growth 

 has been observed at a temperature as low as 10° C. 



While development is most characteristic and luxuriant under 

 aerobic conditions, staphylococci are facultatively anaerobic on suitable 

 media. They grow readily in an atmosphere of hydrogen. 



