This image depicted Bacillus anthracis bacterial colonies, which had been allowed to grow on sheep's blood agar (SBA) for a 24 hour period. Note the classical appearance exhibited in the colonial morphology including a ground-glass, non-pigmented texture with accompanying 'comma' projections from some of the individual rough-edged colonies. In this particular view, you'll note that a 'tenacity test' had been performed using an iinoculating loop, which proved positive for B. anthracis, causing the 'colony to 'stand up' like beaten egg white'.What is anthrax?
CDC/ Megan Mathias and J. Todd Parker
December 4, 2012
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