Skip directly to search Skip directly to A to Z list Skip directly to navigation Skip directly to page options Skip directly to site content


Description:The two test tubes depicted here were being used to carry out a nutritional test involving the identification of various dermatophytic fungal organisms. In this particular instance, the dermatophyte, Trychophyton megninii, was being examined, focusing on its histidine requirements.
A T. megninii inoculum had been added to the unknown growth medium within each of these two test tubes. On the left, the agar medium contained no histidine, while on the right, to the same agar medium, the ammino acid histidine had been added. Note that with the addition of the nutrient histidine, the T. megninii organsms were thriving, and had created a single, cottony-textured fungal colony atop the medium.
High Resolution: Click here for hi-resolution image (18.47 MB)
Content Providers(s):CDC/ Dr. Lucille K. Georg
Creation Date:1970
Photo Credit:
Links:CDC – National Center for Emerging and Zoonotic Infectious Diseases (NCEZID); Division of Foodborne, Waterborne, and Environmental Diseases (DFWED); Dermatophytes
CDC Organization
Skip Navigation Links.

Skip Navigation Links.
Copyright Restrictions:None - This image is in the public domain and thus free of any copyright restrictions. As a matter of courtesy we request that the content provider be credited and notified in any public or private usage of this image.