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Any organism that produces high levels of acid from lactose fermentation can produce a green sheen on EMB agar.
Commonly, E. coli produces a green sheen, but Klebsiella pneumonia and sometimes Klebsiells oxytoca can as well. Although, the colonial morphology of the Klebsiella spp. would be very much different than E. coli. Best to think of EMB differentiating between lactose fermenters and non-lactose fermenters--with the green sheen characteristic being a bonus for some organisms.
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