Enterobacteriaceae IdentificationLaboratory testing algorithm for E. coli, Enterobacter aerogenes, Klebsiella pneumoniae, Serratia marcescens, Proteus vulgaris, and Proteus mirabilis Hover over the animation to start / stop rotationGram Stain Oxidase Test Enterobacteriaceae MacConkey Agar Escherichia coli MacConkey Agar - Positive Lactose Enterobacter aerogenes MacConkey Agar - Positive Lactose Klebsiella pneumoniae MacConkey Agar - Growth MacConkey Agar - Negative Lactose Proteus vulgaris MacConkey Agar - Negative Lactose Proteus mirabilis |