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can old culture of s. aureus not ferment mannitol

About microscopic forms of life, including Bacteria, Archea, protozoans, algae and fungi. Topics relating to viruses, viroids and prions also belong here.

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can old culture of s. aureus not ferment mannitol

Postby thuydeebird » Sat Apr 21, 2012 6:22 pm

Is it possible for an old culture of s. Aureus to not be able to ferment mannitol (on an MSA plate) efficiently? The first time that I streak my unknown on an MSA plate, there was growth and fermentation of mannitol. Through other biochemical test, I was able to narrow it down to S. Aureus. However, when I streak the unknown on another MSA plate again, it was not able to ferment mannitol (it remain pink). Is there an explanation for this?
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