This photograph depicts the colonial morphology displayed by Gram-negative Yersinia pestis bacteria, which was grown on a medium of MacConkey agar, for a 48 hour time period, at a temperature of 37�C. See PHIL 12488, for a closer appearance of Y. pestis bacterial colonies grown on the same medium, and at the same temperature , but for half the time period (24hr). Yersinia pestis is pathogenic towards humans, and is responsible for causing the disease known as plague.
CDC/ Amanda Moore, MT; Todd Parker, PhD; Audra Marsh
December 4, 2012
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