Medical Laboratory Scientist (MLS) ASCP Practice Exam

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How does Group D Enterococcus differ from Group D Streptococcus in terms of bile esculin tests?

Both are bile esculin +

Group D Enterococcus and Group D Streptococcus are both capable of hydrolyzing esculin in the presence of bile, which is tested through the bile esculin test. In this test, the presence of enterococci or streptococci that can break down esculin in the presence of bile indicates a positive result. This ability to hydrolyze esculin occurs because of the enzymatic activity that these bacteria possess, leading to a color change in the medium that confirms their presence.

While there may be variations in other tests or characteristics between these two groups, the efficacy of both in the bile esculin test is a shared trait, marking them both as bile esculin positive. Therefore, the correct understanding of this aspect is crucial for distinguishing between these organisms in clinical diagnostics.

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Group D Enterococcus is bile esculin -

Group D Streptococcus is bile esculin -

Group D Enterococcus is bile esculin variable

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