There is no need of astonishment by the described characteristics
of the suspected Escherichia coli (belonging to the family of
Enterobacteriaceae). E.coli is a bacterium with a great capacity
of diversity in phenotypic apparition.
I am not familiar with the EMB-agar, but what you are describing
should not be contradictive to the diagnosis of a non-lactose (or
perhaps slow-lactose) fermenting, mucoid strain of E.coli. But,
of course, you should always verify the diagnosis of a bacterium
species you do not recognize, by complementary testing.
Regards, Bjorn Osterman, MD
SMCL/Bakt, Stockholm, Sweden
e-mail: bjorn.osterman at alinks.se
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