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Description:This image shows a Petri dish culture plate containing Tinsdale medium, inoculated with a mixed culture of Corynebacterium diphtheria bacteria, which grew colonies that displayed the morphologically-expected dark-brown to black coloration of this Gram-positive bacterium.
Tinsdale agar plate growth (Remel, Lenexa, KS, USA) gave rise to black colonies with a brown halo, typical of cysteinase-producing C. diphtheriae, C. ulcerans, or C. pseudotuberculosis. Containing the hydrogen sulfide indicators, L-cysteine and sodium thiosulfate, Tinsdale medium is used when isolating and identifying C. diphtheria bacteria.
High Resolution: Click here for hi-resolution image (18.35 MB)
Content Providers(s):CDC/ Dr. Theo Hawkins
Creation Date:1979
Photo Credit:
CDC Organization
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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.