You dropped your 24-hour-old mannitol salt agar and MacConkey agar plates of Sta

Question

You dropped your 24-hour-old mannitol salt agar and MacConkey agar plates of Staphylococcus aureus. How would you visually be able to tell the difference now?

You dropped your 24-hour-old mannitol salt agar and MacConkey agar plates of Staphylococcus aureus. How would you visually be able to tell the difference now?

A) You won't be able to visually tell them apart. There will be no growth on either plate. B) S. aureus on mannitol salt agar will have a clear halo of lysed red blood cells (beta hemolysis), whereas the MacConkey agar would inhibit any growth. C) You won't be able to visually tell them apart. S. aureus will have a yellow halo (fermentation) on both agars. D) S. aureus on mannitol salt agar will have a yellow halo (fermentation), whereas the crystal violet on the MacConkey agar would inhibit its growth.

Explanation / Answer

When 24-hour-old mannitol salt agar and MacConkey agar plates of Staphylococcus aureus are dropped the visually difference is  S. aureus on mannitol salt agar will have a yellow halo (fermentation), whereas the crystal violet on the MacConkey agar would inhibit its growth.

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