Methyl Violet: a Selective Agent for Differentiation of Klebsiella pneumoniae from Enterobacter aerogenes and Other Gram-Negative Organisms

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Abstract
Three selective media for differentiation of Klebsiella pneumoniae from Enterobacter aerogenes on the basis of colonial morphology were evaluated. Using methyl violet 2B as a selective agent, strains of K. pneumoniae isolated from urine, fresh water, and fresh produce were tested against other members of Enterobacteriaceae in addition to strains of Aeromonas hydrophila and Pseudomonas aeruginosa. Comparison of colonial morphology showed K. pneumoniae produced larger, smoother colonies than other bacteria tested. These media were developed to aid in presumptive separation of K. pneumoniae from E. aerogenes in the monitoring of bacterial quality of water.

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