Mycology Review: Identification of Common Dermatophytes. Sandy Arduin, MT (ASCP) Bruce Palma, MT (ASCP) Mycology Unit Bureau of Laboratories Michigan Department of Community Health
Sandy Arduin, MT (ASCP)
Bruce Palma, MT (ASCP)
Bureau of Laboratories
Michigan Department of Community Health
This project was supported in part by Grant/Cooperative Agreement NumberU10/CCU523395-01 from the Centers for Disease Control and Prevention (CDC)
Its contents are solely the responsibility of Michigan Department of Community Health and do not necessarily represent the official views of CDC
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Macroscopic colony morphology descriptions are based on cultures grown on SAB agar.
Colony morphology may vary on other culture media.
Trichophyton mentagrophytes, Hair perforation test is positive.
Trichophyton rubrum, Hair perforation test is negative.
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Colony growth is rapid, downy to wooly, cream to yellow on the surface with a yellow to yellow- orange reverse.
Colony growth is moderately rapid, powdery to granular, white to cream colored on the surface with a yellowish, brown or red-brown reverse.
Colony growth is rapid, downy to powdery, white to buff on the surface, with a red-brown reverse.
Colony growth is very slow, glabrous to lightly downy,white, sometimes yellow or grey on the surface without any characteristic pigment on the reverse.
Growth is enhanced on media with thiamine and inositol, and is more rapid at 37ºC than at 25ºC.
Colony growth is slow to moderate, downy, white on the surface with a red to brown reverse.
Colony growth is rapid, downy, becoming powdery to granular, cream, tawny-buff, or pale cinnamon on the surface with a beige to red-brown reverse.
Anthropophilic A fungus (dermatophyte) which grows preferentially on humans, rather than on animals or in soil.
Conidium A unicellular or multicellular fungal element which serves as an asexual reproductive structure.
Dermatophyte A mould belonging to the genera: Epidermophyton, Microsporum, Trichophyton; typically infecting skin, hair and nails.
Fusoid Spindle shaped; ellipsoidal with two tapered ends.
Glabrous Smooth, lacking hairs.
Geophilic A fungus (dermatophyte) which grows preferentially on substrates found in the soil, rather than on animals or humans.
Macroconidia The larger of two types of conidia produced by the same fungus. May be multicellular.
Microconidia The smaller of two types of conidia produced by the same fungus. Typically unicellular.
Onychomycosis Fungal infection of the nails.
Spiral hyphae Hyphae curved into a spiral. Typically seen in Trichophyton mentagrophytes, but may be seen in other dermatophytes as well
Verrucose Having many warts
Zoophilic A fungus (dermatophyte) which grows preferentially on animals, rather than on humans or in soil.