The results of biochemical tests for Escherichia coli should be positive for lactose reaction, and the results of IMViC (Indole-Methyl Red-Acetyl Methyl Alcohol-Citrate Utilization Test) should be positive – positive – negative -negative. From the pathogenesis of Escherichia coli, the bacterium can ferment lactose to produce acid and gas, so the lactose test is positive.IMViC are I: Indole test (positive if it is rosy red, negative if it does not change color), M: Methyl red test (positive if it is red, negative if it is yellow), V: Acetylmethyl methanol (V-P) test (negative if it produces no color), and C: Citrate Utilization Test (containing bromine). Muscovite blue slant blue is a positive reaction, green color is negative; slant containing phenol red if red is a positive reaction, yellow is negative). IMViC is mainly used for rapid identification of E. coli and E. aerogenes. If it is Enterobacter aerogenes, the IMViC result is: –++. The above introduction is for reference only and is subject to doctor’s interpretation.