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I have to pick either a differential test OR confirmation test to prove Ecoli is negative...

I have to pick either a differential test OR confirmation test to prove Ecoli is negative and explain why. What test discusses about Ecoli and explains about it? (besides MacConkey)

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Ans. E.coli is Escherichia coli which is gram negative, bacillus , facultative anaerobic in respiration. It enters the body through uncooked food , raw vegetables. E.coli can be proved by differential or confirmatory test like EMB that is eosin methylene blue which is selective as well as differential in nature .It is selective for gram negative bacteria .It is selective because of methylene blue and eosin dye .And it is differential based on lactose fermentation .E.coli appears metallic green in color on this media . This test is used to differentiate between enteric lactose fermentator and non fermentor .

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