Which of the Following May Be Added to Normal Media

Question

Which of the following may be added to normal media to make it more selective for staphylococci?
A)7.5% salt
B)0.5% HCl
C)1.0% glucose
D)5.0% mannose

Accepted Answer

Staphylococci have the ability to tolerate high concentrations of salt, so adding 7.5% salt to the media makes it more selective for staphylococci. HCl and glucose are not selective for staphylococci and mannose is more commonly used to select for E. coli.