EMB (Eosin Methylene Blue) agar inhibits gram positive bacteria, so it is instrumental in isolating gram negative pathogens of the lower digestive tract. the normal flora bacterium E.coli is readily detected on EMB agar by the green sheen that the colonies develop. most pathogens don't develop such as sheen, so microbiologists has a much easier job of isolating the organism responsible for the disease. EMB therefore both a selective and differential medium.
Source: Kandel, J. and Larry McKane. (1996). Microbilogy: Essentials and Application (2nd Ed). United States of America: McGrawHill,Inc.
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