What is the colony morphology for Strep pneumoniae

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What is the colony morphology for Strep pneumoniae

Post by SweetSarah » Wed Mar 07, 2012 9:37 am

How do the colonies appear on media, for example specifically, on blood agar and Phenylethyl alcohol (PEA)?

I understand that it's alpha hemolytic on blood agar and shows greenish color around the colonies. But what I don't get and would like to make sure is how do the colonies look like on it??
For example, should the colonies be tiny, circular, convex, irregular, what color if any....??

:arrow: Does this sound accurate for Strep pneumoniae. This is what I got for my PEA agar:
-colony morphology for PEA= tiny,pinpoint,circular/convex, irregular, and smooth colonies on the PEA.

I've already done the gram stain and got a gram positive stain. I get that but I just want to make sure how I can write the morphology of the colonies and how they should look, in case I am wrong with this.

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Post by JorgeLobo » Wed Mar 07, 2012 2:36 pm

I'd not look for characteristic colony morphology on PEA. Colonies of Strep pnuemo are fairly distinctive on sheep blood agar - alpha hemolytic and forming a flat colony with a central depression.

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