How is diphtheria characterized on Gram stain?

Updated: Jan 18, 2019
  • Author: Bruce M Lo, MD, MBA, CPE, RDMS, FACEP, FAAEM, FACHE; Chief Editor: Jeter (Jay) Pritchard Taylor, III, MD  more...
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Answer

Gram stain shows club-shaped, nonencapsulated, nonmotile bacilli found in clusters.

Immunofluorescent staining of 4-hour cultures or methylene blue–stained specimen may sometimes allow for a speedy identification.


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