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You are working up a throat culture. Standard procedure in plating throat cultures in your lab includes dropping an A disc near the initial inoculum in the first quandrant when streaking the specimen.

You examine the blood agar plate and see moderate normal flora and many beta hemolytic colonies that do not grow up to the A disc. 

The beta hemolytic colonies are catalase negative gram positive cocci.

Which pathogen is in this throat culture?

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