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After 24 hours a blood culture from a newborn grows catalase-negative, gram-positive cocci. The bacterial colonies are small, translucent and beta-hemolytic on a blood agar plate. Biochemical test results of a pure culture are:bacitracin resistant, CAMP rxn positive, bile esculin not hydrolyzed, no growth on 65% NaCl broth.Assuming that all controls react properly and reactions are verified, the next step would be to:

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