Under a low magnification of 5X, this photograph depicted a number of Legionella pneumophila colonies that had been cultivated on Feeley-Gorman (FG) agar. Note the 'cut-glass' appearance displayed by the round, off-white colored colonies. FG agar is used particularly in the cultivation of Legionella spp. bacteria, and is composed of casein (acid hydrolyzed), agar, beef extract, starch, cysteine and iron (III) pyrophosphate (Fe4(P2O7)3).
CDC/ Dr. Jim Feeley
December 1, 2012
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