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A Blood Culture Yields Yellow-Pigmented, Beta-Hemolytic, Catalase-Positive, Gram-Positive Cocci in Clusters

Question 21

Multiple Choice

A blood culture yields yellow-pigmented, beta-hemolytic, catalase-positive, gram-positive cocci in clusters. The department is out of Staphylococcus latex agglutination reagent. The microbiologist sets up a tube coagulase and mannitol salt agar. She incubates both at 35°C in CO2 overnight. The next day the coagulase test is negative and the mannitol salt agar displays yellow colonies. How will you proceed with these results?


A) Report this organism as Staphylococcus aureus
B) Report this organism as Staphylococcus not S. aureus
C) Repeat the tests due to invalid results
D) Test the organism for novobiocin resistance

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