How accurate are Wood lamp and gram staining for the identification of erythrasma?

Updated: Jun 11, 2020
  • Author: Abdul-Ghani Kibbi, MD, FACP; Chief Editor: William D James, MD  more...
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Comparing the diagnostic yield between Wood lamp examination and Gram stain, it was found that 9% of patients were positive on the former and 15.6% were positive on the latter. Using both Wood lamp examination and Gram staining concurrently resulted in a higher yield of 22.1% for positive patients. [30]

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