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The page below is a sample from the LabCE course Respiratory Case Study: Possible Pertussis Infection. Access the complete course and earn ASCLS P.A.C.E.-approved continuing education credits by subscribing online.

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Case Study, continued
After four days of incubation at 37°C, small, shiny colonies are observed on the Regan-Lowe agar. A Gram stain of the culture is performed, with the results shown below. How would you describe the Gram stain result?

Image is courtesy of the Centers for Disease Control and Prevention (CDC)

Please select the single best answer