E. coli-Enterobacteria Chromogenic Agar is used for the differentiation of E.coli from the rest of Enterobacteria. In the same plate it is able to enumerate E. coli and enterobacteria. The medium can be inoculated directly with a loop.E.coli is easily distinguishable due to the dark blue-greenish blue colony color. Enterobacteria will growth as magenta colonies. The rest of bacteria are inhibited, and in case of growing, they will grow as colorless colonies. Note: Some Shigella strains contain the same enzyme as E. coli and can grow as light blue colonies. E.coli O157:H7 do not contain the enzyme to produce blue colonies and will growh magenta.
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