On CHROMagar blue colonies with arabinose negative, which Enterococcus species is suspected?

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Multiple Choice

On CHROMagar blue colonies with arabinose negative, which Enterococcus species is suspected?

On CHROMagar blue, colony color reflects specific enzyme activity in different Enterococcus species, while a simple carbohydrate test like arabinose fermentation helps separate closely related species. When you see blue colonies and the arabinose test is negative, that particular combination points to Enterococcus casseliflavus. This species tends to be arabinose negative, and its blue appearance on this chromogenic medium fits the profile described. In contrast, many other Enterococcus species that appear blue on this plate are arabinose positive, so they wouldn’t match the observed negative result.

On CHROMagar blue, colony color reflects specific enzyme activity in different Enterococcus species, while a simple carbohydrate test like arabinose fermentation helps separate closely related species. When you see blue colonies and the arabinose test is negative, that particular combination points to Enterococcus casseliflavus. This species tends to be arabinose negative, and its blue appearance on this chromogenic medium fits the profile described. In contrast, many other Enterococcus species that appear blue on this plate are arabinose positive, so they wouldn’t match the observed negative result.

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