ID#: 6710
Caption:
This photograph depicts the colonial growth pattern displayed by the Gram-negative, enteric bacterium Yersinia enterocolitica, cultivated on this triple sugar iron agar (TSI) medium. TSI is used when differentiating bacteria, primarily from the family Enterobacteriaceae, according to their ability to ferment glucose, lactose or sucrose, as well as produce hydrogen sulfide, (H2S). If a yellow coloration results, as on the right, it means that there was ongoing fermentation while if a reddish color results, as on the left, it means that there was no fermentation taking place.
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Content Provider(s): CDC
Creation Date: 1976
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