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2. (2 pts) What is the specific media component in MSA allows for SELECTION (hint- not the pH indicator)? Name a genus of gra
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MSA or Mannitol Salt agar is a selective, differential and indicator medium used to isolate and identify microbes like Staphylococcus aureus.

Composition mainly includes:

1) D mannitol

2)Sodium chloride

3) phenol red( indicator mentioned in question)

4)other components

Of these 7.5% NaCl helps to select only those bacteria which can tolerate high salt concentrations.Species of staphylococci are able to tolerate this salt concentration but other pathogenic bacteria may not.

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