A single method to stain Malassezia furfur and Corynebacterium minutissimum in scales.
The scales are collected by pressing small pieces of scotch tape (about 4 cm length and 2 cm width) onto the lesions and following withdrawal the furfuraceous scales will remain on the glue side. These pieces are then immersed for some minutes in lactophenol-cotton blue stain. Following absorption of the stain the scales are washed in current water to remove the excess of blue stain, dried with filter paper, dehydrated via passage in two bottles containing absolute alcohol and then placed in xylene in a centrifugation tube. The xylene dissolves the scotch tape glue and the scales fall free in the tube. After centrifugation and decantation the scales concentrated on the bottom of the tube are collected with a platinum-loop, placed in Canada balsam on a microscopy slide and closed with a cover slip. The preparations are then ready to be submitted to microscopic examination. Other stains may also be used instead of lactophenol-cotton blue. This method is simple, easily performed, and offers good conditions to study these fungi as well as being useful for the diagnosis of the diseases that they cause.
Padilha-Gonçalves
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Universidade do Rio de Janeiro (UNI-RIO), Brazil.
D003352:Corynebacterium / Q000302:isolation & purification*; D004894:Erythrasma / Q000175:diagnosis / Q000382:microbiology*; D006801:Humans; D008290:Malassezia / Q000302:isolation & purification*; D013194:Staining and Labeling / Q000379:methods; D014010:Tinea Versicolor / Q000175:diagnosis / Q000382:microbiology*