What is the role of culture and staining in the workup of erythrasma?

Updated: Jun 11, 2020
  • Author: Abdul-Ghani Kibbi, MD, FACP; Chief Editor: William D James, MD  more...
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In culture media composed of 20% fetal bovine serum, 2% agar, 78% tissue culture medium #199, and 0.05% tris, the organisms grow as nonhemolytic, 1- to 1.5-mm smooth colonies. Methylene blue stain may be used to highlight both the fungal spores of pityriasis versicolor and the curved or club-shaped bacterial rods of C minutissimum, the causative agent of erythrasma, in case both organisms coexist. [25]

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