The slow-growing organism Trichophyton rubrum produces a flat or heaped-up colony, generally white to reddish with a cottony or velvety surface. The cherry-red color is best observed on the reverse side of the colony. This organism is capable of infecting which of the following?

a. Hair and nails
b. Skin and nails
c. Hair and skin
d. Hair, skin, and nails


D
T. rubrum is a slow-growing organism that infects hair, skin, and nails. T. rubrum produces a flat or heaped-up colony, generally white to reddish with a cottony or velvety surface. The characte-ristic cherry-red color is best observed on the reverse side of the colony; however, this color is produced only after 3 to 4 weeks of incubation.

Biology & Microbiology

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